you are ridiculous.

in both rap or hip hop, there are compositional elements that make both just as musical as the beatles, or neil young. just because the lyrics don't have melodic structure, doesn't mean the rest of the song does. and i don't really see many folks humming along to rap tunes...somehow i doubt it's because the lyrics lack melody. you may not realize it, but it takes talent to A) write the lyrics to a rap, B) set them to music, and C) arrange those samples so they sound good.

and it's "bass," not base.

and yes, percussion instruments do have pitch. varying pitches (very present in drum beats and samples) + (polyphony) + rhythmic structure = music.