Sleeping with Siren

The group is known primarily for vocalist Kellin Quinn's versatility of his falsetto vocal range to which even the name for the band was directly derived and inspired for his musical role. Their second album, Let's Cheers to This, was released on May 10, 2011. The first song from the album, "Do It Now Remember It Later", was released on April 7, 2011.[3]
Current
Gabe Barham - drums (since 2009)
Jack Fowler - lead guitar (since 2011)
Justin Hills - bass guitar (since 2009)
Jesse Lawson - rhythm guitar, backing vocals (since 2010)
Kellin Quinn - lead vocals, keyboards, programming (since 2009)
Former
Brandon McMaster - lead guitar, backing vocals (2009–2010) (Now in The Crimson Armada)
Nick Trombino - rhythm guitar, backing vocals (2009–2010)
Brian Calzini - vocals (2009) (Now in We Are Defiance)
Paul Russell - bass (2009)
Dave Aguliar - rhythm guitar (2009)
Alex Kaladjian - drums (2009)
List of guest appearances
Kellin Quinn (2010) - "The Amazing Atom" (At the Skylines)
Kellin Quinn and Jesse Lawson (2010) - "There's a Situation @ the Shore" (Lakeland)
Kellin Quinn (2010) - "In the Face of Death" (The Last Word)
Kellin Quinn (2011) - "Airplanes Pt. 2" (We Are Defiance feat. Tom Denney formerly of A Day To Remember)
Kellin Quinn (2011) - "The Dying Hymn" (The Color Morale, as composer) [4]
Kellin Quinn (2011) - "Bring On The Empty Horses" (Call Us Forgotten)
Kellin Quinn (2011) - "Once Upon a Time In Mexico" (Cascades)
http://en.wikipedia.org/wiki/Sleeping_with_Sirens