Well Freddie was a huge gospel fan, so you'll find plenty of influence in his songs.
Also Led Zeppelin were a big influence - listen to the first album, you'll hear it.
As for Roger, he has mentioned The Beatles many times - which, btw, is also one of the only bands where the drummer also sings. No don't mention the Eagles, please... ;-)
And lastly, Baroch music was quite one of Freddie's passions. Boh Rhap does have quite a lot of that influence.
take it to 11