While they started out in the late '60s as a psychedelic band, delved into progressive rock, and even recorded an album in collaboration with the Royal Philharmonic Orchestra, Deep Purple achieved their greatest success as a strong, straightforward, hard rock band, anchored by the powerful guitar work of Ritchie Blackmore and the show-stopping vocals of Ian Gillan (and later David Coverdale). From 1970's Deep Purple in Rock to 1974's Stormbringer, Deep Purple were one of the most popular hard rock bands on Earth, and Deepest Purple: The Very Best of Deep Purple captures the band at the top of their form on some of their best-known songs. Selections include "Smoke on the Water," "Space Truckin'," "Highway Star," "Speed King," "Woman from Tokyo," "Fireball," and many more.