Who hard as me what, I did a song with R but
I ain't on no RnB stuff
I ain't no pretender,

from Cassidy – 11 Minute Freestyle on Hot 97 Lyrics on Rap Genius

Meaning

R refers to R.Kelly, an RnB singer. Cassidys' first hit song was Hotel, in which featured R. Kelly

But he says he isn’t going to do RnB by himself because that ain’t him, he ain’t gunna be a poser or a pretender.

http://www.youtube.com/watch?v=MKOT6teSarY

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