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The voices in question can be found in these two choruses:
I Feel Like Dying - Lil' Wayne
and also in this song starting at 0:13 seconds:
I hope I'm not crazy in thinking they are similar or could be categorized together. They have a high-pitched, sort of nasally sound to my ear. I've always enjoyed the sound and have a nostalgic attachment to them.
The voice has been sped up in each case. This is often called the "chipmunk effect" after the 1958 recording by "Alvin and the Chipmunks" where this was first commercially used.
