g-unit- beg for mercy

GT40, there are some rap singles that also have depth to them, you just have to find the right ones!
The reason these tracks are so popular is because they have catchy beats with words that are made to rhyme to them. It's easier to pop this track on and just listen or "vibe" to it, you don't have to listen to the words or anything.
But I agree with you, if you want something with depth, rap isn't the best stuff to listen to...well at least MTV rap isn't. It's the "hidden" tracks that don't get over played on radio stations and promoted on MTV from albums, or the underground/unreleased tracks that usually have nice meaning to them.

Download tupac - changes, mama was a little girl, dear mama, shorty wanna be a thug.

That's just one artist...

those two new black eyed peas tracks...etc etc.

I hope you get where I'm coming from.
Oh and just give those tupac tracks a try, all of. Listen to them while reading the lyrics to them. I believe you'll agree they have some meaning even if you don't like them. Or maybe you'll still hate them since it's rap, I'm not sure. Just try em...