"S'posin'" is a jazz standard with music by Paul Denniker and lyrics by Andy Razaf, published in 1929. It is an English-language song. The original recording was made in April 1929 by Bob Haring and His Orchestra and first released as a single titled "S'posin' - You and I in the Moonlight". Several other bands and singers recorded it the same year, including Seger Ellis, Jimmie Noone's Apex Club Orchestra, Rudy Vallee and His Connecticut Yankees, Paul Whiteman and His Orchestra, and Smith Ballew. Later versions include those by Fats Waller and His Rhythm (1936), Bing Crosby (1939), Frank Sinatra (1948 and 1961), Dean Martin (1966) and Sarah Vaughan (1967). The song has been recorded often in swing and vocal styles.
