The acappella series of Adrian & Raz hold all the vocal gems of their established labels Adrian & Raz, Amsterdam Trance Records and Beat Service audio. Tracks featured on volume 4 are Hearts Connected (Omnia), Pain Into Purpose (Eximinds), Lost In Space (Julian Vincent & Mark Otten) and So Out Of Reach (Space RockerZ). Vocalists featured are Cathy Burton, Sarah Russell, Shannon Hurley and Ellie Lawson.