At least on Bohemian Rhapsody the group was one with the song; they played the instruments and did backing vocals. It was Queen.
Beth, on the other hand, was sung by Peter Criss, with session musicians on piano and strings. Criss was backed by a tape in concert. The other members of KISS had zilch to do with the song.
OK then. Thanks for the lesson.
I saw Queen in concert, and during Bohemian Rhapsody, when it got to the heavily overdubbed section of the song...they played a tape.