Hmmm. There are several genres I'm fond of. I love Rock music, Pop music(Mostly only Asian Pop though), and a little bit of rap/urban is good but not a whole lot of it.
Rock tends to have a good beat almost all of the time. Pop has some great vocals and the additional instruments like saxaphones, and non-guitar/drums instruments are always good. Some of the rap/urban music has a good beat a fair amount of the time as well but I'm not always a fan of the lyrics, and soem of the beats can be irritating