I like many kind of music, except rap or songs with heavy emphasis on lyrics. There are some exceptions, but in general I prefer instrumental music, or song that are sung in a language that I don't understand (such as in Japanese). I consider unknown language as instrument. Of course, even then it depends how the singing works together with the rest of the song.
There is also certain type of music that I enjoy listening more than others especially when I'm focusing on a demanding task, such as drawing or architectural design brainstorming. Usually this type of music has a lot of repetition in it, are long and loop seamlessly, making them ideal for long periods of concentration. In fact, I tend to listen one song in loop for hours. It takes me very long to get bored on certain songs. I have found that techno, trance and some game soundtracks are the best kind of music for my needs. I like it when there is very distinct bass thump carrying the song from the start to the very