#1
say you have a rhythm section comprising of guitar, bass and drums. can you put a drum solo over it (just like a guitar) without making it sound like a complete mess? please give me examples of songs that have done that.
#4
Not really metal anymore but Swedish prog band Pain Of Salvation ends their song "No Way" from Road Salt One with a drum solo that has the band playing over it.

Also, Between The Buried And Me's "Swim To The Moon" kind of has that with a drum solo with short bursts from the rest of the band all over it.
Q: Favourite Pink Floyd song?
A: The one where they get wicked high and play Emin and A for an hour.