Mark ... I had a similar situation watching a group in a casino ... I asked my wife to point out who was singing/playing a certain part and when she said she couldn't, I said "EXACTLY" !!! ...
They also did Bohemian Rhapsody and the other songs you mentioned ... this didn't happen to be a group out of the Bronx, NY, with the lead singer being the father of two of the other band members, did it ? ...