It's D5, though.
I was just going to begin to post hints.
EDIT: Here are some hints for you.
A1: Album by a band that was the former project of a member of a well-known melodic death metal band. They do thrash metal, though.
A3: The first track of this album calls for having sex with an evil entity - the track itself is an instrumental.
A4: This is the latest record of an American deathcore band (according to Wikipedia - I have no idea what classifies as deathcore).
A5: Third record of a very popular rock band. All their album names follow a very boring pattern.
B2: Third album of a band who's drummer once played in a Christian metal band.
B4: Last album before the temporary split of a band that both wolfking and I have talked about quite a bit on these forums.
C2: Album by a Canadian rock band. The title track is a piano-only instrumental of thirty seconds.
C4: Album by a German punk band that has already toured with the Sex Pistols and Bad Religion.
C5: This band became known for their unorthodox covers (song covers, not album covers). This album doesn't feature any covers anymore, though.
D4: Album of a Welsh rock band. This album contains their only number one single on the Alternative Songs chart.
E1: Second album of a Scottish indie rock band. They went on hiatus after this album, but they are to reunite soon.
Hope that helps, though I still can't see many people knowing a lot of this stuff.