The Red Tour was the third concert tour by American singer-songwriter Taylor Swift.
 Launched in support of Swift's fourth studio album, "Red" (2012), the tour began on March 13, 2013 in Omaha, Nebraska and concluded on June 12, 2014 in Singapore.
Cardiff, Wales: 6/23/04 is the second full live album by the Red Hot Chili Peppers, released in 2015, and was recorded on June 23, 2004 in Cardiff, Wales at Millennium Stadium during the band's Roll on the Red Tour.
 The album consists of a soundboard recording of the full show from that date, and an MP3 version is available as a free download through the band's website.
 A lossless (FLAC) version of the album is also available for purchase.
The Solo Mobile / Eckō Red Tour was a tour organised in August 2005 featuring Keshia Chanté, Amanda Stott, Christine Evans and Cassie Steele.
 The main sponsors were Solo Mobile, a Bell Mobility brand, and Eckō Red, an Eckō Unltd.
 brand.
 The Student Price Card was also a large-scale sponsor.
Red is the fourth studio album by American singer-songwriter Taylor Swift.
 It was released on October 22, 2012, by Big Machine Records, as the follow-up to her third studio album, "Speak Now".
 The album title was inspired by the "semi-toxic relationships" that Swift experienced during the process of conceiving this album, which Swift described the emotions she felt as "red emotions" due to their intense and tumultuous nature.
 "Red" touches on Swift's signature themes of love and heartbreak, however, from a more mature perspective while exploring other themes such as fame and the pressure of being in the limelight.
 The album features collaborations with producers and guest artists such as Gary Lightbody of Snow Patrol and Ed Sheeran and is noted for Swift's experimentation with new musical genres.
 Swift completed The Red Tour in support of the album on June 12, 2014, which became the highest-grossing tour of all time by a country artist, grossing over $150 million.
The Silhouette in Red Tour was the second tour by Welsh singer Bonnie Tyler to promote her tenth studio album "Silhouette in Red".
 The tour began in January 1994 and ended in March, branching into twelve European countries.
 Hansa Records released the "Silhouette in Red Tour Book", which could be obtained from the concert venues, which contains details about the entire tour in a 24 pages.
In the study of ancient Egyptian mathematics, red auxiliary numbers were additive numbers that summed to a numerator used in Middle Kingdom arithmetic problems.
 In the 1650 BCE Rhind Mathematical Papyrus (RMP), the additive set of divisors were written in red ink.
 Red auxiliary numbers were used for several purposes The red auxiliary numbers were divisors of a greatest common divisor (GCD) that was used to convert fractions of the form 2/n to unit fraction series.
 The RMP 2/n table reported Egyptian fraction series by multiplying 2/n by a least common multiple (LCM) m, written as a unity (m/m), that obtained 2m/mn.
 Ahmes the RMP author, practiced the selection of red auxiliary numbers in RMP 21, 22, and 23 and detailed other aspects of the red number method in RMP 36.
 The scaled 2m/mn rational number was converted to a unit fraction series by finding the best set of divisors of (GCD) mn, as discussed below.
Red Tour EP was a tour-only EP release by The Album Leaf, available at the band's live shows since 2005.
 In addition to its five tracks, it also contains a video for "The Spinning Makes Me Dizzy" shot on tour.
The Roll on the Red Tour was a concert tour by American rock band Red Hot Chili Peppers.
 The tour followed the band's hugely successful "By the Way tour".
 During this tour the band recorded their first live album, Live in Hyde Park.
 Near the tour's end, the dates mainly consisted of benefit and tribute shows including the Bridge School Benefit and a tribute show to longtime friend, Johnny Ramone.
 The band's performance was released two years later on DVD as "Too Tough to Die: A Tribute to Johnny Ramone".
 Ramone, who was too sick to attend the tribute (although show host, Rob Zombie called him during the event), would pass away a three days after the tribute show.
 John Frusciante was among many famous friends and family to attend his funeral and memorial celebration.
 On March 17, 2015, the band released "" a free MP3 download of the entire show through their website.
The Red River system is a network of rivers surrounding the main river - Red River in North Vietnam.
 These branches of the system contribute to or receive water from Red River.
 Red River system, joining with the Thái Bình river system in the northeast, creates the Red River Delta - the second largest delta in Vietnam.
 Because of the close relation between Red River system and Thái Bình river system, the two system are known as the common name "Red and Thai Binh rivers system".
 Alluvium of the Red River system creates the central and south Red River Delta.
 Two banks of the rivers are protected by a great dyke system.
Live in Hyde Park is the first live album released by American band Red Hot Chili Peppers, recorded over three record-breaking nights at Hyde Park, in London on June 19, 20 and 25, 2004 during the band's Roll on the Red Tour.
 These three concerts became the highest-grossing concerts at a single venue in history.
 This double album compiled from these three shows went straight to No. 1 in the UK and stayed there for a total of two weeks, selling over 120,000 copies.

Question: What singer do both Red and The Red Tour have in common?
Answer: Taylor Swift