Well. . . I blame my girlfriend for these being mine but
This
Some of this
and most of these (as long as they're Luka/ nice beat and instrumental)
Iosys and Vocaloid. I used to make fun of them but my god. . . I can't quit listening! Graah!
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Also, game raps. Not like Brentalfloss, though. The ones that place popular rap songs over video game OST's and somehow they flow beautifully. They're awesome, but embarrassing due to them being such cheesy rappers. (Also I listen to Blackeyed Peas by themselves.)