Question: What kind of group does Vertical Horizon and Against the Current have in common?

Context paragraphs:
Duo (Richard Marx and Matt Scannell album): Duo is an acoustic album by Richard Marx and Vertical Horizon vocalist Matt Scannell.  The disc was released on May 12, 2008, exclusively through RichardMarx.com and was later made available for sale at their concerts together as well.  Marx and Scannell exhibit both of their acclaimed works.  Marx remade a version of "Always On Your Mind," for his 2008 album "Sundown".  The disc is predominantly done on acoustic guitar aside from the track "Give You Back" performed on piano.

Everything You Want (Vertical Horizon song): "Everything You Want" is a song by American alternative rock band Vertical Horizon and the eponymous second single from their third studio album "Everything You Want".  Released on April 4, 2000.  The single reached the top of the "Billboard" Hot 100 after a 26-week climb on July 15 of that year.  "Everything You Want" is Vertical Horizon's most successful single.

Vertical Horizon: Vertical Horizon is an American alternative rock band formed at Georgetown University in Washington, D.C. in 1991.  The band is best known for their 1999 hit, "Everything You Want".  Their most recent album, "Echoes from the Underground," was released in October 2013.

Against the Current (band): Against the Current (often abbreviated as ATC) is an American pop rock band based in Poughkeepsie, New York and formed in 2011.  The band currently consists of lead vocalist Chrissy Costanza, guitarist Dan Gow, and drummer Will Ferri.  The group gained a sizable YouTube following after posting their covers of popular songs from a variety of different artists.

Matt Scannell: Matthew "Matt" Scannell is an American singer, guitarist, songwriter and musician.  Scannell is the lead vocalist, lead guitarist, primary songwriter, and founding member of the alternative rock band Vertical Horizon.

Duo Live: Duo Live is a live album by Richard Marx (a fifth for Marx, 22nd overall) and, Vertical Horizon band member, Matt Scannell (second for Scannell, eighth overall).  Marx and Scannell exhibit both of their acclaimed works and share lead vocals on three songs, including a never before released song.

David Bendeth: David Bendeth (born 17 June 1954) is a multi-platinum award-winning record producer.  He has either Produced or Mixed albums by Paramore, Breaking Benjamin, Elvis Presley, Papa Roach, Killswitch Engage, In Flames, The Red Jumpsuit Apparatus, Hawthorne Heights, Underoath, A Day To Remember, Taking Back Sunday, Chiodos, The Almost, Vertical Horizon, SR-71, As I Lay Dying, All Time Low, Bruce Hornsby, Hedley, Kaiser Chiefs, Bring Me the Horizon, Of Mice & Men, Asking Alexandria, We Came as Romans, Coldrain, Tonight Alive, Beartooth, Young Guns, I Prevail, Sleeping with Sirens, Northlane .

Ed Toth: Ed Toth is an American musician who currently plays drums for The Doobie Brothers.  Toth joined the Doobies in 2005 following his departure from Vertical Horizon.

Ben Grosse: Ben Grosse is an American record producer and mixer, known for his signature sound involving metal and hard rock music.  Grosse has mixed and produced numerous albums for popular artists such as Marilyn Manson, Sevendust, Disturbed, Breaking Benjamin, Filter, Fuel, Depeche Mode, Richard Barone, Alter Bridge, Red, Vertical Horizon, Love and Death, Hollywood Undead, Ben Folds, Thirty Seconds to Mars, Underoath and many others.  As the mixer for many well-known songs from artists like Red Hot Chili Peppers ("Higher Ground"), Republica ("Ready to Go" ), Third Eye Blind ("Graduate" from the "Can't Hardly Wait" soundtrack), and The Flaming Lips ("She Don't Use Jelly"), he currently works with a staff at his own studio, The Mix Room, in Burbank, California.

Live Stages: Live Stages is a live album by Vertical Horizon, released by Rhythmic Records in early 1997, and later re-released by RCA Records.  This album was recorded live at Ziggy's in Winston-Salem, North Carolina.  It featured mostly songs from the band's second album, Running on Ice, (and "On the Sea" from "There and Back Again"), as well as new material.  This was the first Vertical Horizon album to feature Scannell more prominently on electric guitar, and also the first to include drummer Ed Toth.  Ryan Fisher played bass.

Supporting paragraphs: Vertical Horizon Against the Current (band)
Answer: rock band