Houston: We Have a Drinking Problem is the second studio album by Bad Astronaut, released in 2002 on the Honest Don's independent record label.
 The title alludes to the statement "Houston, we have a problem" somewhat inaccurately attributed to astronaut Jim Lovell aboard the Apollo 13 spacecraft when an explosion in the Service Module endangered the crew.
 The track "Our Greatest Year" features a harmonica solo by John Popper of Blues Traveler fame.
The John Popper Project (formal name The John Popper Project Featuring DJ Logic) is an American fusion music group.
 The band's style is a combination of rock, hip hop, and improvisational jazz.
"Jogi Song" is a song by Pakistani Sufi-rock band The Sketches in which guest appearance have been given by Grammy Award winning harmonica player John Popper and its produced by Jono Manson.
 The "Jogi" song is recorded in Pakistan and US.
 This song is nominated for Best Song in the World Beat category at the New Mexico Music Awards.
Zygote is the debut studio album by American singer-songwriter John Popper.
 Produced by Terry Manning, it was released on September 7, 1999, less than a month after Popper lost a good friend and fellow bandmember, Bobby Sheehan.
 Accompanying Popper on this album is Carter Beauford (of the Dave Matthews Band) on drums, and Crugie Riccio on guitar, Rob Clores, and Dave Ares (all of Cycomotogoat).
Blues Traveler, the eponymous debut album from Blues Traveler, was released on A&M Records in 1990.
 It establishes the band's trademark jam band sound featuring John Popper's harmonica.
"What Would You Say" is a song by American rock group Dave Matthews Band.
 It was released in September 1994 as the lead single from their debut album "Under the Table and Dreaming".
 It reached #11 on the Modern Rock Tracks chart.
 In June 1995 it peaked at #9 on the Mainstream Top 40 chart.
 John Popper of Blues Traveler performed the harmonica solo in the breakdown before the last verse.
Kevin Kinney, known professionally as Kevn Kinney (born March 12, 1961), is an American vocalist and guitarist, best known as lead singer and guitarist of Atlanta rock band Drivin N Cryin.
 A native of Milwaukee, Wisconsin, Kinney formed Drivin N Cryin with bassist Tim Nielsen and drummer Paul Lenz after moving to Atlanta, Georgia in 1985.
 Kinney and his bandmates remained a part of the Atlanta underground rock scene until the album "Fly Me Courageous", and its hit-single title track, brought them to a national audience on mainstream rock radio.
 A prolific songwriter, collaborator and performer, Kinney has been noted for his numerous side projects throughout his career, all while keeping Drivin N Cryin an active band.
 As a solo artist, he recorded the 1990 folk rock album "MacDougal Blues" with members of R.E.M., and the 2000 album "The Flower & the Knife" with various members of the jam-band scene, including Warren Haynes and John Popper.
 Starting in 2002, he formed the project "Sun Tangled Angel Revival" (S.T.A.R.) to release Americana and roots rock music.
 The most recent Drivin N Cryin album "The Great American Bubble Factory", was released in 2009, followed by a series of four EPs in 2012 and 2013.
 In 2011, Kinney released an album with The Golden Palominos, a long-standing musical collaborative project headed by Anton Fier.
John Popper (born March 29, 1967) is an American musician and songwriter.
 He is most famous for his role as frontman of rock band Blues Traveler performing harmonica, guitar, and vocals.
Beyoncé Giselle Knowles-Carter ( ; born September 4, 1981) is an American singer, songwriter, dancer, and actress.
 Born and raised in Houston, Texas, Beyoncé performed in various singing and dancing competitions as a child.
 She rose to fame in the late 1990s as lead singer of the R&B girl-group Destiny's Child.
 Managed by her father, Mathew Knowles, the group became one of the world's best-selling girl groups in history.
 Their hiatus saw Beyoncé's theatrical film debut in "Austin Powers in Goldmember" (2002) and the release of her debut album, "Dangerously in Love" (2003).
 The album established her as a solo artist worldwide, earned five Grammy Awards, and featured the "Billboard" Hot 100 number-one singles "Crazy in Love" and "Baby Boy".
Joseph Patrick Moore (born October 1, 1969) is an American musician from Knoxville, Tennessee, currently based in Henderson, Nevada.
 He is a bass player, composer, arranger and record producer who has played alongside Colonel Bruce Hampton, Earl Klugh, Stewart Copeland, John Popper, Derek Trucks, and many other notable musicians.
 In 2003, he founded Blue Canoe Records, the internet's first all-digital independent jazz label; he co-owns the label with Travis Prescott.

Question: Who plays the harmonica, John Popper or Beyoncé?
Answer: John Popper