Introducing Deep Purple would be (as we say) taking logs into forest or as Englishmen say taking owls to Athens. I'll keep it short.
Deep Purple are an English hard rock band formed in Hertfordshire in 1968. Along with Led Zeppelin and Black Sabbath, they are considered one of the pioneers of heavy metal and hard rock, although the members of the band have always refused to label themselves as the former. They have sold over 100 million albums worldwide.

Each DCC CD was pressed directly from the original studio master session tapes ; the purest source of musical information and engineered to produce the finest CD sound quality available. Every DCC compact disc delivers the music to you with all the depth, dynamics, and richness of the live recording session. We invite you to hear the three-dimensional quality of the music just as the artist intended for it to sound. The DCC proprietary mastering technology extracts and transparently stores more musical information from the original master tapes than any other method in existence. For the discriminating listener, the results include: a wider range of frequencies, increased depth and room dimension cues, clarity, and separation of instruments. The DCC technology substantially decreases characteristics such as hardness and glare bringing the sound of CD even closer to the warmth and openess of analogue.