Question: What role did Ed Roland and Adam Duritz perform in their respective bands, Collective Soul and Counting Crows?

full_context: Document 1: Ed Robertson: Lloyd Edward Elwyn "Ed" Robertson (born October 25, 1970) is a Canadian musician, best known as the lead singer, guitarist, and songwriter of the band Barenaked Ladies. He, along with former member Steven Page, founded the group in 1988. As of Page's departure in 2009, Robertson and bassist Jim Creeggan are the only remaining original members of the band.
Document 2: Maria (Counting Crows): Maria is a recurring character in the songs written by Adam Duritz, the songwriter and lead singer of Counting Crows. Maria has appeared in the lyrics of five Counting Crows songs and in two other songs written by Duritz, and has fueled speculation and debate among fans. Duritz contends that she is fictional.
Document 3: Saturday Nights &amp; Sunday Mornings: Saturday Nights & Sunday Mornings is the fifth studio album by Counting Crows, released in the United States on March 25, 2008. It is thematically divided into two sides: the rock music of "Saturday Nights" and the more country-influenced "Sunday Mornings." Vocalist and lyricist Adam Duritz states that the album "is about really wanting to mean something and failing to do it. You want your life to mean something. You want to be somebody and then what you turn out to be is so much less than what you thought you were going to be."
Document 4: Gregg Rolie: Gregg Alan Rolie (born June 17, 1947, Seattle, Washington, United States) is an American singer and keyboardist. Rolie served as lead singer of the bands Santana, Journey and Abraxas Pool – all of which he co-founded. He also helmed rock group The Storm, and currently performs with his Gregg Rolie Band. Rolie is a two-time inductee of the Rock and Roll Hall of Fame, having been inducted both as a member of Santana in 1998 and as a member of Journey in 2017.
Document 5: David Bryson: David Bryson (born October 5, 1961) is a guitarist and vocalist for Counting Crows. He was a student of guitarist Joe Satriani. Prior to forming Counting Crows with Adam Duritz, he produced recordings by Duritz and his band, The Himalayans, from San Francisco, California. He formed Counting Crows with Duritz in San Francisco in 1991.
Document 6: Roland Gift: Roland Lee Gift (born 28 May 1961) is a British singer and actor. He was the lead singer of the band Fine Young Cannibals, who rose to fame in the late 1980s.
Document 7: Ed Roland: Edgar Eugene Roland, Jr. (born August 3, 1963) is an American musician, singer-songwriter and record producer. He is best known as the lead vocalist and primary songwriter of the rock band Collective Soul. He is also active with a new project, Ed Roland and the Sweet Tea Project.
Document 8: Counting Crows: Counting Crows is an American rock band from Berkeley, California, formed in 1991. The band consists of Adam Duritz (lead vocals, piano), David Bryson (guitar), Charlie Gillingham (keyboards, accordion), Dan Vickrey (lead guitar), David Immerglück (guitar, banjo, mandolin), Jim Bogios (drums, percussion) and Millard Powers (bass guitar).
Document 9: Dean Roland: Dean Roland (born October 10, 1972) is an American musician. He is best known for being the rhythm guitarist of the band Collective Soul, an alternative rock band fronted by his older brother Ed. He is also part of the rock duo Magnets & Ghosts alongside Ryan Potesta.
Document 10: Ed Roland discography: The discography of American musician Ed Roland consists of two studio albums as a solo artist, nine studio albums with Collective Soul, and one studio album with Ed Roland and the Sweet Tea Project.
Document 11: Adam Duritz: Adam Fredric Duritz (born August 1, 1964) is an American musician, songwriter, record producer, and film producer. He is best known for his role as frontman and vocalist for the rock band Counting Crows, of which he is a founding member and principal composer of their catalog of songs.
Document 12: Eddie Vedder: Eddie Vedder (born Edward Louis Severson; December 23, 1964) is an American musician, singer and songwriter best known as a member of the rock band Pearl Jam, with whom he performs lead vocals and is one of three guitarists. He is known for his powerful baritone vocals. He also appeared as a guest vocalist in Temple of the Dog, the one-off tribute band dedicated to the late singer Andrew Wood.
Document 13: Ed Rose: Ed Rose is an American sound engineer and record producer. He has worked extensively with groups in the modern emo and pop punk scenes. He also co-owns Black Lodge Recording with Rob Pope and his brother Ryan Pope, members of the emo band The Get Up Kids.
Document 14: Adam Lazzara: Adam Burbank Lazzara (born September 22, 1981) is an American singer, songwriter and musician. He is lead singer of the rock band Taking Back Sunday. Along with singing lead vocals, Lazzara plays guitar and occasionally the harmonica.
Document 15: Adam Levine: Adam Noah Levine (born March 18, 1979) is an American singer, songwriter, multi-instrumentalist, actor, and record producer. He is the lead singer for the pop rock band Maroon 5.
ground_truth: lead vocalist