Estelle Vs. Mirwais

Naive boy (2008)
instrumental : Mirwais - Naive song
acapella : Estelle - American boy

Avril Lavigne Vs. Coldplay

The complicated scientist (2008)
instrumental : Coldplay - The scientist
acapella : Avril Lavigne - Complicated

An alternative version with different arrangments on the voice :
The complicated scientist V2 (2008)
instrumental : Coldplay - The scientist
acapella : Avril Lavigne - Complicated

Kanye West Vs. Red Hot / Katy Perry Vs. Klaxons

A bootleg I did 3 months ago, but didn't posted yet :

California Sky (2008)
instrumental : Kanye West - Touch the sky
acapellas : - Red Hot Chili Peppers - Dani California
- The Avalanches - Frontier psychiatrist

The second one, simply surfing on the overused Katy Perry !

I kissed a golden girl (2008)
instrumental : Klaxons - Golden skans
acapella : Katy Perry - I kissed a girl