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

Context paragraphs:
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.

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.

Glider (band): Glider is a 4 piece jazz-rock combo created by Jim Bogios and David Immergluck - both members of Counting Crows.  The band also includes bass player Yoshi Sako (Beatropolis) and Danny Eisenberg (Acacia Collective, Ryan Adams Band) on the Hammond B3.  Glider was formed to allow Jim Bogios and David Immergluck to play music that they both enjoyed as children when they were not playing with Counting Crows, and was primarily modeled after Booker T and the M.G.'s and The Meters.  Bogios, Immergluck and Eisenberg have had numerous collaborations around the San Francisco Bay Area.  The band has never released a studio recording, but a number of bootleg recordings and videos from live shows and a handful of studio recordings have been circulated among fans.  Between 2003 and 2009, Glider played shows in San Francisco, Oakland, Berkeley and Sacramento between Counting Crows tours.  Glider has been inactive since their last show on December 26, 2009 at Cafe Du Nord in San Francisco.

Freeloaders (film): Freeloaders is an American ensemble comedy film directed by Dan Rosen and written by Rosen and singer Dave Gibbs.  The film is produced by the Broken Lizard comedy troupe and is independently financed.  "Freeloaders" stars Clifton Collins Jr., Josh Lawson, Kevin Sussman, Zoe Boyle, Nat Faxon, Warren Hutcherson, Jane Seymour, Olivia Munn, Dave Foley and Counting Crows lead singer Adam Duritz.  It follows a group of friends who find their luxurious lifestyle threatened when the rock star they freeload off decides to sell his home.

Dream This: Dream This is the debut album from Joe 90, released on Adam Duritz of Counting Crows's label E Pluribus Unum through Geffen. " Rolling Stone" said "singer-guitarist Chris Seefried steers along melodically facile, softly yelping rockers like 'Mascara' and 'Drive' - the album's showstopper - with velvety imprecision."

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.

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.

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."

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).

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.

Supporting paragraphs: Ed Roland Adam Duritz
Answer: lead vocalist