THIS IS VOCAROCK is an album by 164. The album features 15 tracks sung by Hatsune Miku, GUMI, and MAYU. Tracks 11 and 12 are a collaboration between 164 and 40meterP, with drums by Pierre Nakano from Ling Tosite Sigure. The album website can be seen here. A crossfade of the album can be heard on Nicovideo.
The album can be purchased from Amazon.