John Sturgill Simpson (born June 8, 1978) is an American Grammy Award-winning country music and roots rock singer-songwriter.
 As of August 2017, he has released three albums as a solo artist.
 He released two albums independently, "High Top Mountain" in 2013 and "Metamodern Sounds in Country Music" in 2014.
 His second album is notable for being nominated for a Grammy Award for Best Americana Album, being listed 18th on "Rolling Stone's" "50 Best Albums of 2014," and also being named among "NPR's 50 Favorite Albums of 2014."
 His third studio album, "A Sailor's Guide to Earth", was released on Atlantic Records and was Simpson's first major-label release, later earning him Best Country Album at the 59th Grammy Awards while also being nominated for Album of the Year.
Dave Bassett is an American Grammy nominated multi-platinum songwriter and record producer.
 Originally from Chicago, a Deerfield High School (Illinois) graduate, Bassett relocated to Los Angeles to pursue a musical career after a chance on-stage performance with U2.
In Flight is the first solo album by singer and producer Linda Perry, released in 1996.
 It was produced by Bill Bottrell (Sheryl Crow, Michael Jackson).
 Perry re-released the album in 2005 on her own record label Custard Records.
 The re-release contains original videos from the singles "Freeway" and "Fill Me Up".
 Perry says that Interscope, her record label in 1996, which had been hoping for something a little catchier than "In Flight", didn't promote the album, and the disappointing sales rattled her.
 "My gut feeling that I relied on failed me. . . .
 I was devastated", Perry says.
"Samantha" is a song by the American alternative rock band Hole.
 It is the fifth track on the band's fourth studio album, "Nobody's Daughter", released on Mercury Records on April 23, 2010.
 Written by vocalist Courtney Love, The Smashing Pumpkins frontman Billy Corgan and music producer Linda Perry, "Samantha" was originally planned as the album's lead single. "
Skinny Little Bitch" was later released as the album's lead single on March 12, 2010 and "Samantha" did not receive a single release reputedly due to the controversy over its composition.
Justin Boller (born December 6, 1983), also known as Sky, is an American Grammy nominated record producer, singer and GMA Dove Award-winning songwriter.
"Candyman" is a song recorded by American singer Christina Aguilera for the second disc of her fifth studio album, "Back to Basics" (2006).
 She co-wrote the song with its producer Linda Perry.
 "Candyman" was planned to be released as the second single from "Back to Basics"; however, RCA Records decided to release "Hurt" instead.
 Subsequently, the track was released in February 2007 as the third single from the album.
 "Candyman" is described as a pop and R&B song that imitates swing music whose lyrics are about sexual intercourse.
Linda Perry (born April 15, 1965) is an American Grammy nominated rock singer-songwriter, and record producer.
 She first became known as the lead singer and primary songwriter of 4 Non Blondes and has since founded two record labels and composed and produced hit songs for several other artists.
 They include: "Beautiful" by Christina Aguilera; "What You Waiting For?
" by Gwen Stefani; and "Get the Party Started" by P!nk.
 Perry has also contributed to albums by Adele, Alicia Keys, and Courtney Love, as well as signing and distributing James Blunt in the United States.
 Perry was also inducted into the Songwriters Hall of Fame in 2015.
Johan Bobäck also known as "Kermit" (b.  1972 (1972-) ) is a record producer and songwriter from Sweden.
 "Kermit" has written and produced songs for many artists, including, Garou, Chris Norman, Darin, Troy This, Jeanette Biedermann (Undress to the Beat), Linda Sundblad, Play, Ola Svensson and Elin Lanto.
 He also wrote and produced two songs ("Into the Nightlife" and "Echo") with Cyndi Lauper and Peer Åström for Lauper's, Grammy Nominated, 2008 album "Bring Ya to the Brink".
 Both songs became singles.
 Linda Sundblad's single "2 all my girls" and Darin's single "Viva la vida" by Coldplay are both produced by Kermit.
 He was also involved, both as writer and producer, in Linda Sundblad's album "Manifest", released in early 2010.
 Bobäck has also written music for the Golden Globe winning TV show "Glee" by Fox.
 In 2011, the song "1000 ships" with Rachel Platten appeared in the TV show "Grey's Anatomy".
 His other songs as a writer and producer include "I´m in love" and "One day" with Ola.
"Letter to God" is a song by alternative rock band Hole, written solely by music producer Linda Perry.
 The song was released as the band's sixteenth single, and third and final single from their fourth studio album "Nobody's Daughter", on April 20, 2010, as a digital download.
 It is the only Hole single not to have been written by a member of the band and was featured in the short animated film, "Dark Night Of The Soul", directed by Michael Mouris.
Aaron A. Brooks, also known as, Aaron Kinsley-Brooks (born January 24, 1964, San Francisco, California) is an American rock musician, drummer, producer and composer.
 He co-founded The Little Death with Moby, Laura Dawn and Daron Murphy.
 He is a founding member of the American alternative rock band, The Mars Bonfire.
 Aaron also plays or has played drums for the electronic pop band Leisure Cruise; Grammy nominated electro-pop chanteuse Angela McCluskey (of Télépopmusik and Wild Colonials); Grammy award-winning producer/songwriter Mark Hudson; Emmy award-winning actress and singer Jackie Cruz; Grammy award-winning artist Moby; Singer/songwriter and progressive political activist Laura Dawn; Grammy award-winning bassist/songwriter and rock musician Duff McKagen of Guns N' Roses; Circle of Soul; Erin Evermore; Grammy award-winning pianist and songwriter A.J. Croce; Grammy winning singer/songwriter Lana Del Ray; Writer, radio host, progressive political comic and guitarist/singer Jamie Kilstein and his band The Agenda; Model/actress/singer/songwriter Heidi Merrill; And NY based rock singer Carleigh Jade.

Question: American Grammy nominated rock singer-songwriter and record producer Linda Perry wrote "Letter to God" for which alternative rock band?
Answer: Hole