Some people here have mentioned "rap music" and others have compared rap to "other types of music". I hate to sound like an old fuddy-duddy, but rap isn't music. Here's the dictionary definition of "music"
- an art of sound in time that expresses ideas and emotions in significant forms through the elements of rhythm, melody, harmony, and color.
- the tones or sounds employed, occurring in single line (melody) or multiple lines (harmony), and sounded or to be sounded by one or more voices or instruments, or both.
- musical work or compositions for singing or playing.
- the written or printed score of a musical composition.
- such scores collectively.
- any sweet, pleasing, or harmonious sounds or sound: the music of the waves.
- appreciation of or responsiveness to musical sounds or harmonies: Music was in his very soul.
Sorry, but rap doesn't fit any of those, (espically definition 6).
That being said, rap doesn't have to be bad. If the words glorify the Lord, then I can't see that it's any worse than any other Christian poetry (which is what rap is - a type of poetry that is read in a specific way). If you enjoy listening to it (which I don't, as you might already have guessed), then go ahead and listen and don't let anyone tell you that rap is somehow in and of itself bad.