Oohoo, I'm not the greatest at shooters but I do love them regardless. (Probably a bad idea of me to play virtually every Touhou game, which are ridiculously hard shooters)
The ones i have played are mainly Gradius and Gradius III? And I played Abadox on the NES more for the design than anything else. :p Oh, and Parodius which is just...so random. :p

YES I LOVE THAT MUSIC. Most of the Genesis music for Sonic is really awesome and catchy but Chemical Plant Zone has some great music there.