Listen to I Must Be Mad online. I Must Be Mad is an English language song and is sung by Rich De Rosa, Dial, The WDR Big Band and Oatts. I Must Be Mad, from the album Rediscovered Ellington: New Takes on Duke's Rare and Unheard Music, was released in the year 2017. The duration of the song is 7:22. Download English songs online from JioSaavn.