Artie (Kevin McHale) and Mercedes ( Amber Riley )
Sam sings Baby in the episode "Comeback".
Entitled "End Credits" (Made Famous by Glee Cast)
Laryngitis!
Idina Menzel or Shelby the Vocal Adrenaline's (competitive glee club) coach
K.D. Lang
The whole glee club sings Push It in season 1 episode 2, Showmance.
Toby Keith sings the song Red Solo Cup.
its not lean on you its lean on me and its Bill Withers
If you mean ridin' solo it's buy Jason Derulo If it's called running solo idk who sings it
i am not sure
Valerie by The Zutons
The song Artie sings is Dancing With Myself
Iyaz
Sam sings Baby in the episode "Comeback".
Gwyneth Paltrow
Entitled "End Credits" (Made Famous by Glee Cast)
Bill Withers