Instrumental Duet,Piano C Instrument - Level 2 - Digital Download SKU: A0.881050 Composed by Nickolas Ashford and Valerie Simpson. Arranged by Marco Polo Ignacio. Contemporary. Lead Sheet / Fake Book. 2 pages. MARCO POLO IGNACIO #6873877. Published by MARCO POLO IGNACIO (A0.881050). The Boss is a 1979 song written and produced by Ashford & Simpson and recorded by American singer Diana Ross, who released it as a single on the Motown label. It was the first release from the album of the same title (1979). The song was released on May 22, 1979, a day before the album release.