Guitar Leads Volume 1 contains 47 lead segments from 14 Classic Rock songs. The full 8 volume set, called the Guitar Leads Master Volume, inlcudes more than 425 riffs from 80 all time classic songs. The course features real guitar audio, at both full and half speed, correct tablature and a looping system to play the riffs continuously. The Free Volume 1 is for PCs only. The Master Volume is available for MAC's and PC's.