Question: Are Pete Loeffler and Chris Robinson both singers in American rock bands?

full_context: Document 1: Dave Peters: Dave Peters is an American musician. He was the original guitarist for the band Eighteen Visions, guitarist for the band Throwdown, and, as of 2002, the vocalist for Throwdown. He did guest vocals for the song "Unleash" by groove metal band Soulfly, for the song "Feel as Though You Could" by Demon Hunter, and the song "Despair" for Living Sacrifice. He is straight edge.
Document 2: Chevelle (band): Chevelle is an American alternative metal band that formed in 1995 in the Chicago suburb of Wildwood, Illinois. The band was originally composed of brothers: Pete Loeffler (lead vocals and guitar), Sam Loeffler (drums and percussion) and Joe Loeffler (bass and backing vocals). When Joe left the band in 2005, Geno Lenardo subbed-in as the bassist until he was replaced by Pete and Sam's brother-in-law, Dean Bernardini.
Document 3: Pete Loeffler: Pete Loeffler (born October 19, 1976) is a musician, known for his work with the Chicago-area rock band Chevelle, for which he is the lead vocalist and sole guitar player.
Document 4: Peter Cetera (album): Peter Cetera, released in December 1981, is the self-titled first solo release by then-Chicago bassist and lead vocalist, Peter Cetera.
Document 5: Rich Robinson: Richard Spencer "Rich" Robinson (born May 24, 1969) is an American musician and founding member of the rock and roll band The Black Crowes. Along with older brother Chris Robinson, Rich formed the band in 1984 (originally called "Mr. Crowes Garden") while the two were attending Walton High School in Marietta, Georgia. At age 15, Rich wrote the music to what would become one of the band’s first singles; "She Talks to Angels".
Document 6: Chris Eldridge: Chris Eldridge is an American guitarist and singer best known for being a member of Punch Brothers. He was also a founding member of the bluegrass band The Infamous Stringdusters. His father is noted banjoist Ben Eldridge of the Seldom Scene.
Document 7: Chris Robinson Brotherhood: Chris Robinson Brotherhood is an American blues rock band formed in 2011 by Black Crowes singer Chris Robinson while The Black Crowes were on hiatus. The band has released four studio albums: "Big Moon Ritual", "The Magic Door", "Phosphorescent Harvest", and "Any Way You Love, We Know How You Feel". The band consists of Robinson, guitarist Neal Casal, keyboardist Adam MacDougall, bassist Jeff Hill (who replaced original bassist Mark Dutton in 2016), and drummer Tony Leone (who replaced original drummer George Sluppick in January 2015).
Document 8: Rob Crow: Robertdale Rulon "Rob" Crow, Jr. (born February 21, 1971) is an American singer and multi-instrumentalist from San Diego, California known for the long list of bands and projects he is associated with, mostly in the genres of indie rock and math rock. He is best known for his involvement with the bands Pinback (co-led by Zach Smith from Three Mile Pilot), Heavy Vegetable, Physics, Optiganally Yours and Thingy; in addition he has also led or leads the bands Advertising, Alpha Males, Altron Tube, Cthugha, Fantasy Mission Force, Goblin Cock, Holy Smokes, The Ladies, Other Men and Remote Action Sequence Project, as well as performing and releasing solo records under his own name and under the name Snotnose.
Document 9: Peter Cetera: Peter Paul Cetera ( ; born September 13, 1944) is an American singer, songwriter, and bassist best known for being an original member of the rock band Chicago (1967–1985), before launching a successful solo career. His career as a recording artist encompasses seventeen albums with Chicago and eight solo albums.
Document 10: Chris Robinson (singer): Christopher Mark "Chris" Robinson (born December 20, 1966) is an American musician. He was the singer of the rock and roll band The Black Crowes and brother of its guitarist Rich Robinson.
Document 11: Chris Daughtry: Christopher Adam Daughtry (born December 26, 1979) is an American singer, songwriter, musician and actor best known as the lead vocalist and rhythm guitarist for the rock band Daughtry and as the fourth-place contestant on the fifth season of "American Idol". After his elimination from "Idol", he was given a record deal by RCA Records and formed a band called Daughtry with bassist Julia Driscoll of notorious adult contemporary band, "Adults In The Middle Of The Street." Their self-titled debut album became the fastest selling debut rock album in Nielsen Soundscan history, selling more than one million copies after just five weeks of release. The album was recorded before the band was officially formed, making Chris Daughtry the only official member present on the album.
Document 12: Rob Clores: Rob Clores is an American, New York-based keyboard player, who has toured and recorded with The Black Crowes, Tom Jones, Enrique Iglesias, Men at Work frontman Colin Hay, Marius Muller Westernhagen, Joan Osborne, Blues Traveler frontman John Popper, Spin Doctors frontman Chris Barron, Southside Johnny & The Asbury Jukes, Jesse Malin, Willie Nile, The Dirty Pearls and James Maddock.
Document 13: Dickie Peterson: Richard Allan Peterson (September 12, 1946 – October 12, 2009) was an American musician, best known as the bassist and lead singer for Blue Cheer. He also recorded two solo albums: "Child of the Darkness" and "Tramp".
Document 14: Letter from a Thief: "Letter from a Thief" is the second single from Chevelle's album, "Sci-Fi Crimes". It was released on December 7, 2009. Chevelle originally debuted this track on April 9, 2009 at a concert in Atlanta. Frontman Pete Loeffler said the song is about a personal experience for the band when their gear was stolen in Dallas, and his prized red PRS guitar seen in the video for "Send the Pain Below" was stolen, along with the rest of the band's gear, and returned by a man in California who returned the guitar to PRS after learning it was Loeffler's.
Document 15: Chris Weber: Chris Weber (born October 16, 1966) is an American musician best known as the guitarist and founder of the groups U.P.O. and Hollywood Rose (which featured future Guns N' Roses members Axl Rose, Slash, Izzy Stradlin, and Steven Adler). With U.P.O., he released two albums, "No Pleasantries" (2000) and "The Heavy" (2004), while the Hollywood Rose demos, recorded in 1984, were released in 2004 titled "The Roots of Guns N' Roses".
ground_truth: yes