Question: Who has been active for the longer period of time, The Bluebells or Gnarls Barkley?

Context paragraphs:
Delsym: Delsym is a brand of cough medicine owned by Reckitt Benckiser, and manufactured at Unither Manufacturing in Rochester, NY.  It is different from most brands of cough medicine in that the active ingredient is "time released".  The time release feature allows the drug to suppress the cough reflex for a longer period of time.  The active ingredient per teaspoon (5 mL) is dextromethorphan polistirex, equivalent to dextromethorphan HBr 30 mg.

Holly Palmer: Holly Palmer (born c. 1971) is an American singer-songwriter based in Los Angeles, California.  She has released five albums as a solo artist, and has toured extensively as a vocalist with acts including David Bowie and Gnarls Barkley.  She is also the "Cheesecake" partner in Bubbles & Cheesecake, an Internet-based, multi-media collaboration with multi-disciplinary artist Allee Willis.  Other musicians with whom she has collaborated include David Bowie, Paula Cole, Dr. Dre, Billy Preston, Dave Navarro and Michael Bublé, among others.

Gnarls Barkley: Gnarls Barkley is an American soul duo, composed of singer-songwriter CeeLo Green and producer Danger Mouse.  They have released two studio albums, "St. Elsewhere" (2006) and "The Odd Couple" (2008).  "St. Elsewhere" was recorded on the Warner Music UK label, and contained their hit single "Crazy" which topped at number two on the US Hot 100, and topped the charts in the UK.  It was also nominated at the 2007 Grammy Awards for Record of the Year, and was platinum certified for shipping over 1,000,000 records.  "The Odd Couple" was recorded on Downtown Records label, and was scheduled for release in April 2008, but due to a leak of their album over the internet, they were forced to release it early.  The album in its entirety received good reviews, but did not have as much commercial success as their first album.

Moving average crossover: In the statistics of time series, and in particular the analysis of financial time series for stock trading purposes, a moving-average crossover occurs when, on plotting two moving averages each based on different degrees of smoothing, the traces of these moving averages cross.  It does not predict future direction but shows trends.  This indicator uses two (or more) moving averages, a slower moving average and a faster moving average.  The faster moving average is a short term moving average.  For end-of-day stock markets, for example, it may be 5-, 10- or 25-day period while the slower moving average is medium or long term moving average (e.g. 50-, 100- or 200-day period).  A short term moving average is faster because it only considers prices over short period of time and is thus more reactive to daily price changes.  On the other hand, a long term moving average is deemed slower as it encapsulates prices over a longer period and is more lethargic.  However, it tends to smooth out price noises which are often reflected in short term moving averages.

Gnarls Barkley discography: The discography of Gnarls Barkley, an American alternative hip hop duo composed of record producer Danger Mouse and soul singer Cee Lo Green, consists of two studio albums, two extended plays, seven singles and seven music videos.  The duo originally met in the late 1990s, and began to record music together in 2003 following the release of Danger Mouse's 2003 album "Ghetto Pop Life".  Their first single, "Crazy", was released in 2006; it achieved worldwide chart success, reaching number two on the US "Billboard" Hot 100 – where it was certified double platinum by the Recording Industry Association of America (RIAA) – and reaching the top ten of the Australian, New Zealand and Swiss singles charts, among others.  It also topped the UK Singles Chart, attracting considerable attention for becoming the first song ever to top the chart on digital download sales alone, following a change to the chart's eligibility rules allowing songs to chart purely on digital sales providing that it was given a physical release the following week.  The song appeared on Gnarls Barkley's debut studio album, "St. Elsewhere", which peaked at number four on the US "Billboard" 200 as well as topping the New Zealand and United Kingdom albums charts.  Three further singles – "Smiley Faces", which reached the top ten of the UK and Irish singles charts, "Who Cares? " and a cover of the Violent Femmes song "Gone Daddy Gone" – were released from "St. Elsewhere", although none of them appeared on the "Billboard" Hot 100.

Distributed practice: Distributed practice (also known as spaced repetition or spaced practice) is a learning strategy, where practice is broken up into a number of short sessions – over a longer period of time.  Humans and animals learn items in a list more effectively when they are studied in several sessions spread out over a long period of time, rather than studied repeatedly in a short period of time, a phenomenon called the spacing effect.  The opposite, massed practice, consists of fewer, longer training sessions.  It is generally a less effective method of learning.  For example, when studying for an exam dispersing your studying more frequently over a larger period of time will result in more effective learning than intense study the night before.

Gnarls Biggie: is a hip hop mashup album created in the same vein as Danger Mouse's "The Grey Album".  It was produced by a group of Brooklyn-based DJ's known as Sound Advice.  The album features 11 songs in which the tracks of Gnarls Barkley are cut-up into beats and then layered with raps of The Notorious B.I.G. It was released on July 17, 2006 on the website gnotorious.com and was featured on the websites of the music magazines "VIBE" and "Spin".  There was also a promotional video released on YouTube.  Its album cover parodies the cover of The Notorious B.I.G.'s "Ready to Die" by replacing the baby's head with Cee-Lo's head.  All of the tracks on the album use beats that sample Gnarls Barkley's album "St. Elsewhere".

The Bluebells: The Bluebells were a Scottish indie rock band, active between 1981 and 1986 (later briefly reforming in 1993, 2008–2009 and 2011).

CLAVVS: CLAVVS (pronounced "claws") is an indie pop and trip hop duo from Atlanta, Georgia.  Composed of four-time Grammy Award-winning producer and multi-instrumentalist Graham Marsh (Gnarls Barkley, Kid Cudi, Lauryn Hill) and writer and vocalist Amber Renee, CLAVVS was formed in 2013 in East Atlanta Village.  They debuted with single "Sit You Down" in 2015, which was featured on the international PBS series "The Music Voyager" alongside Janelle Monáe.  Follow-up single "Spectre" was featured in MTV's "Teen Wolf" on season 6, episode 3.  CLAVVS self-released their first full-length album "halfblood" on April 4, 2016.  They have since performed with the likes of Rhye, Ibeyi, Baio, and Ages and Ages.  Their second LP "World Underwater" was released on March 24, 2017.

Spaced retrieval: Spaced retrieval, also known as expanded retrieval or uniform retrieval, is a learning technique, which requires users to rehearse information to be learned at different and increasing spaced intervals of time or a set uniform amount of time.  In testing this type of learning, people are instructed to rehearse a given set of information at a certain time, and each new rehearsal is expected to have a longer period of time between itself and the previous rehearsal or an equal amount of time between rehearsals.  At the end of every trial period there is a test phase.  Landauer and Bjork first studied this technique of learning in 1978.  The study required participants to learn names from flash cards.  Prior to learning participants were placed into five different rehearsal types: uniform short, uniform moderate, uniform long, expanding, and contracting.  These all indicate the amount and spacing of trials between each test.  Uniform trials involve a number of trials between each test stage, but the trial numbers are fixed (e.g. 2-test-2-test-2-test).  Contracting rehearsals involve larger intervals of time between the first few trials and the test phase, but eventually the trials decrease in number.  Expanding involves starting with trials and tests close together, and as they progress the person would have more time between each trial and test (e.g. 1-test-2-test-3-test).  The effectiveness of the rehearsal types was measured by seeing how accurately participants responded during a test phase.  Expanding was proven to be the most important because it produced the highest amount of recall during the test period.

Supporting paragraphs: The Bluebells Gnarls Barkley
Answer: The Bluebells