Can someone give me a list of parodies in Walk Hard: Dewey Cox Story?

[Showstoppa]

Okay, the Bob Dylan and Johnny Cash parodies are pretty obvious. But can someone list the rest? For instance when he was tripping on LSD and made the song Black Sheep, who was the parody based on? I really love classic rock music, so it would be awesome to know. Thanks.

Great movie by the way!