Listen to Musn't Grumble Originally Performed By Chas & Dave online. Musn't Grumble Originally Performed By Chas & Dave is an English language song and is sung by DJ MixMasters. Musn't Grumble Originally Performed By Chas & Dave, from the album Ultimate Classic Chart Ringtones #17, was released in the year 2015. The duration of the song is 0:28. Download English songs online from JioSaavn.