Question: Are Dan McCafferty and Eddie Vedder both singers?

full_context: Document 1: Mike McCready: Michael David "Mike" McCready (born April 5, 1966) is an American musician who serves as the lead guitarist for the American grunge band Pearl Jam. Along with Jeff Ament, Stone Gossard and Eddie Vedder, he is one of the founding members of Pearl Jam. McCready was also a member of the side project bands Flight to Mars, Temple of the Dog, Mad Season and The Rockfords. He is also the proprietor of Hockey Talkter Records.
Document 2: Rock 'n' Roll Telephone: Rock 'n' Roll Telephone is the twenty-third album by Scottish rock band Nazareth, released in June 2014 by Union Square Music. It is their last album with original singer Dan McCafferty who left the group before its release.
Document 3: 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 4: List of Pearl Jam band members: Pearl Jam is an American alternative rock band that formed in Seattle, Washington in 1990. The original incarnation of Pearl Jam included bassist Jeff Ament, guitarists Stone Gossard and Mike McCready, vocalist Eddie Vedder, and drummer Dave Krusen. This line-up recorded Pearl Jam's debut studio album, "Ten". Krusen left the band in May 1991, three months before the album was released.
Document 5: Ozzy Osbourne: John Michael "Ozzy" Osbourne (born 3 December 1948) is an English singer, songwriter, and actor. He rose to prominence in the early 1970s as the lead vocalist of the heavy metal band Black Sabbath. He was fired from Black Sabbath in 1979 and went on to have a successful solo career, releasing 11 studio albums, the first seven of which were all awarded multi-platinum certifications in the US. Osbourne has since reunited with Black Sabbath on several occasions, recording the album "13" in 2013. His longevity and success have earned him the informal title of "Godfather of Heavy Metal".
Document 6: Dan Spitz: Daniel Alan Spitz (born January 28, 1963) is an American musician and watchmaker best known for his work as the lead guitarist, principal songwriter and co-producer of the American heavy metal band Anthrax from 1983 to 1995 and from 2005 to 2008. With Anthrax, Spitz was nominated for three Grammy awards and has been awarded platinum and multiple platinum RIAA certified albums for his entire Anthrax catalog of work. Dan Spitz is the first heavy metal songwriter to have his music playing on two planets. NASA chose his song alongside only 9 other artists such as Frank Sinatra and the Beatles to be played on the Lunar Rover Curiosity making him the first heavy metal artist to have a top 10 charting song on two planets. Spitz also founded the Christian music group Red Lamb alongside Dave Mustaine of Megadeth as his writing partner, the first to bring autism awareness into any genre of music or music video.
Document 7: Temple of the Dog (album): Temple of the Dog is the only studio album by the American rock band Temple of the Dog, released on April 16, 1991, through A&M Records. The album is a tribute to Andrew Wood, the former lead singer of Malfunkshun and Mother Love Bone, who died on March 19, 1990, of a heroin overdose. The album has been certified platinum by the RIAA in the United States.
Document 8: Dan McCafferty: William Daniel "Dan" McCafferty (born 14 October 1946, Dunfermline, Scotland) is a Scottish vocalist, best known as the lead singer for the Scottish hard rock band Nazareth from its founding in 1968 to his retirement from touring with the band in 2013. McCafferty continues to perform solo around the world and record on occasion.
Document 9: Daniel Johns: Daniel Paul Johns (born 22 April 1979) is an Australian musician, singer, and songwriter. Best known as the former front man of the rock band Silverchair, Johns is also one half of The Dissociatives with Paul Mac and, in 2007, was ranked at number 18 on "Rolling Stone"' s list of The 25 Most Under-rated Guitarists.
Document 10: Billy Mackenzie: William MacArthur "Billy" MacKenzie (27 March 1957 – 22 January 1997) was a Scottish singer, with a distinctive high tenor voice; he was best known as a member of The Associates.
Document 11: Pearl Jam: Pearl Jam is an American rock band formed in Seattle, Washington, in 1990. Since its inception, the band's line-up has consisted of Eddie Vedder (lead vocals), Mike McCready (lead guitar), Stone Gossard (rhythm guitar) and Jeff Ament (bass). The band's fifth member is drummer Matt Cameron (also of Soundgarden), who has been with the band since 1998. Boom Gaspar (piano) has also been a session/touring member with the band since 2002. Drummers Dave Krusen, Matt Chamberlain, Dave Abbruzzese and Jack Irons are former members of the band.
Document 12: 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 13: Temple of the Dog: Temple of the Dog was an American rock band that formed in Seattle, Washington in 1990. It was conceived by vocalist Chris Cornell of Soundgarden as a tribute to his friend, the late Andrew Wood, lead singer of the bands Malfunkshun and Mother Love Bone. The line-up included Stone Gossard on rhythm guitar, Jeff Ament on bass guitar (both ex-members of Mother Love Bone), Mike McCready on lead guitar, and Matt Cameron on drums. Eddie Vedder appeared as a guest to provide some lead and backing vocals.
Document 14: Roger Daltrey: Roger Harry Daltrey, {'1': ", '2': ", '3': ", '4': "} (born 1 March 1944) is an English singer and actor. In a career spanning more than 50 years, Daltrey came to prominence in the mid-1960s as the founder and lead singer of the rock band the Who, which released fourteen singles that entered the Top 10 charts in the United Kingdom during the 1960s, 1970s, and 1980s, including "I Can't Explain", "My Generation", "Substitute", "I'm a Boy", "Happy Jack", "Pictures of Lily", "Pinball Wizard", "Won't Get Fooled Again", and "You Better You Bet". Daltrey began his solo career in 1973, while still a member of the Who. Since then, he has released eight studio albums, five compilation albums, and one live album. His solo hits include "Giving It All Away", "Walking the Dog", "Written on the Wind", "Free Me", "Without Your Love", "Walking in My Sleep", "After the Fire", and "Under a Raging Moon". In 2010, he was ranked as number 61 on "Rolling Stone"' s list of the 100 greatest singers of all time.
Document 15: Bon Scott: Ronald Belford "Bon" Scott (9 July 1946 – 19 February 1980) was an Australian singer and songwriter, best known for being the lead vocalist and lyricist of the Australian hard rock band AC/DC from 1974 until his death in 1980.
ground_truth: yes