Question: Are both Idlewild and My Morning Jacket American rock bands?

Context paragraphs:
Okonokos: Okonokos is a live album and concert film by the American band My Morning Jacket released on October 31, 2006.  The album was recorded during the band's fall 2005 Z Tour, over two nights at The Fillmore in San Francisco, California.  This is the first My Morning Jacket album for which frontman Jim James does not receive a production credit; he is credited for "concept/story".

The Waterfall (album): The Waterfall is the seventh studio album by American rock band My Morning Jacket.  Produced by Tucker Martine and group frontman Jim James, the album was released on May 4, 2015 by ATO Records and Capitol Records.  My Morning Jacket rose to prominence in the 2000s with a string of acclaimed albums and praised live performances.  Its sixth album, "Circuital" (2011), was equally well received.  The band toured in support of it for two years before taking a break.  They regrouped in late 2013 to begin work on "The Waterfall", a process which took eighteen months.

Idlewild (band): Idlewild are a Scottish indie rock band that formed in Edinburgh in 1995.  The band's line-up consists of Roddy Woomble (lead vocals), Rod Jones (guitar, backing vocals), Colin Newton (drums), Andrew Mitchell (bass) and Luciano Rossi (keyboards).  To date, Idlewild have released seven full-length studio albums, with their latest, "Everything Ever Written", released in February 2015.

Black Cab Sessions: The Black Cab Sessions is a series of one-song performances by musicians and poets recorded in the back of a black cab and filmed for an internet audience.  A black cab is a type of hackney carriage (taxicab, An Austin FX4 or a Metrocab) common to Britain.  The sessions are recorded while the black cab that serves as the studio travels through city streets, usually in London, England.  Most of the performances feature rock bands, ranging from popular acts such as Death Cab for Cutie, The Kooks and My Morning Jacket to lesser known acts such as the Cave Singers.  Other performances stray from the rock music scene, featuring poetry and beatboxing, for example.

Tom Blankenship: Tom Blankenship is an American rock musician.  He currently plays bass guitar for the Louisville, Kentucky band My Morning Jacket.  In 2012, Blankenship wrote an article on My Morning Jacket, discussing the band and growing up in Louisville, for the July issue of "Louisville Magazine".

My Morning Jacket discography: The discography of American indie rock band My Morning Jacket, consists of seven studio albums, 11 extended plays, 14 singles, four music videos, three compilation albums, four live albums and one video album.  The band signed with independent Darla Records in 1998 before moving to ATO in 2003.  James explained that "At the time, My Morning Jacket was just me and an acoustic guitar in my bedroom, I'd been sending cassette tapes out [and] our first record label, I wrote them a love letter, pretending Darla was a girl that I wanted to woo'.

My Morning Jacket: My Morning Jacket is an American rock band formed in Louisville, Kentucky in 1998.  The band currently consists of vocalist/guitarist Jim James, bassist Tom Blankenship, drummer Patrick Hallahan, guitarist Carl Broemel, and keyboardist Bo Koster.  The band's sound, rooted in rock and country, is often experimental and psychedelic.  The group amassed a following beginning in the 2000s in part due to their live performances.

Jam band: Jam bands are musical groups whose live albums and concerts relate to a unique fan culture that began in the 1960s with the Grateful Dead, and continued with The Allman Brothers Band, which had lengthy jams at concerts.  The performances of these bands typically feature extended musical improvisation ("jams") over rhythmic grooves and chord patterns, and long sets of music that can often cross genre boundaries.  The Grateful Dead continued to grow their fanbase in the second half of the 1980s.  In the mid-1980s the bands Phish, Edie Brickell & New Bohemians, Blues Traveler, Ozric Tentacles, Widespread Panic, Bela Fleck and the Flecktones, Spin Doctors, Col Bruce Hampton and Aquarium Rescue Unit, began touring with Jam band-style concerts.  In the early 1990s and 2000s, a new generation of bands was spurred on by the Grateful Dead's touring and the increased exposure of The Black Crowes, My Morning Jacket, Dave Matthews Band, Widespread Panic and Aquarium Rescue Unit.

My Morning Jacket Does Xmas Fiasco Style: My Morning Jacket Does Xmas Fiasco Style is a 2000 EP by the rock band My Morning Jacket, containing Christmas songs.  Its alternate title is We Wish You a Merry Christmas and a Happy New Year!

Rock the Garden: Rock the Garden is an annual summer music festival organized by the Walker Art Center and Minnesota Public Radio held in Minneapolis, Minnesota.  Launched by the Walker in 1998, the event has been cosponsored by 89.3 The Current and Minnesota Public Radio since 2008, becoming more of an indie rock festival.  Since its founding, Rock the Garden has highlighted national artists such as Wilco, Sonic Youth, David Byrne, MGMT, De La Soul, My Morning Jacket, Spoon, Bon Iver, and The Decemberists, and featured a diverse range of local bands like Low, Doomtree, Fog, Iffy, Cloud Cult, Howler, and Trampled By Turtles.

Supporting paragraphs: Idlewild (band) My Morning Jacket
Answer: no