Remember there are some prizes along the way to the 1000th post so if you use up all your 5 answers right away then 1000 posts is going to be a while.
A heck of a range of musical opinions but I do see a bit of an 70ish - 80ish trend I think.
For me it is hard to separate what bands I like because I like the songs and memories and which I know are simply damn good artists.
I think my number one choice brings though two ideas together.
#1 Queen