another rip off

I heard this on the radio this morning and couldn't believe it. Are there any rappers/mixers out there who every now and then can write their own melodies/music to sample? I can appreciate the creativity of pieces that are mixed well and written well but that isn't the case in this situation. The thing that bothers me the most is all of the people out there that are fed music on top 40 stations and think that all of these pop artists/rappers are totally original and write the entirety of the song including the pieces that they sample. Most people won't know that a great song from Imogen Heap was ruined.