hammer is a house compilation album produced by Nagimiso.SYS. It was released during Comiket 79 under his independent label. It contains tracks by famous producers featuring the vocals of VY1, Megurine Luka, miki, Camui Gackpo, Kagamine Rin and Kagamine Len. The 11th track however, is sung by the utaite 630.
A crossfade can be seen here.