Previously unreleased material comes as Wonder marks 50th anniversary of album with arena tour

Stevie Wonder has expanded the scope of what was already the most epic studio album in his catalogue, 1976’s Songs in the Key of Life.

Four unheard songs from the recording sessions have been released today as a new EP of the same name, marking the 50th anniversary of an album which won album of the year at the Grammys and contains a number of Wonder’s landmark tracks including Sir Duke, As and Isn’t She Lovely.