My genre is Rock. I will also venture into Blues-Rock (e.g. Gary Moore) and Hard Rock where appropriate. Soundtracks are another favorite,
My favorite band is (and has been for at least 25 years) Queen, closely followed by Led Zeppelin.
Other favorites are: David Bowie (up to the mid-eighties, then lost track), AC/DC (up to the 90s), The Who, Meat Loaf (up to Bad Attitude), Gary Moore (his later hard Rock stuff and definitely the Blues) and Pete Townshend among others.
Since I am in Taiwan I also started to enjoy Asian Rock music. The two main bands I enjoy are Wu Bai & China Blue (Taiwan) and Beyond (Hong Kong).
There is loads of single songs of a whole variety of genres and artists I like which would not cause me to buy a whole album. This reaches from Spandau Ballet's Gold all the way to Motörhead's Ace of Spades.