Grammy award-winning soul and jazz star Gregory Porter takes viewers on a 100 year celebration through the mystery, joy and pain that lies behind some of the greatest voices in modern music.

In each of the three episodes Gregory traces the musical journey of three distinct styles of singing - the crooning voice, the truth-telling growl and the show-stopping, virtuosic voice – revealing the surprising pathways each of these classic vocal styles have taken through popular music history, and featuring encounters with some of Gregory's all-time favourite singers.