Amsterdam was credited as the lyricist on the popular 1945 Andrews Sisters hit "Rum and Coca-Cola". However, the original song was written and performed by Trinidadian calypso singer Lord Invader, and composed by Lionel Belasco. Amsterdam had altered some lyrics for the Andrews Sisters record, and was subsequently involved in a copyright suit over the song, which dragged on until 1948. In the end, Lord Invader was given a substantial royalty payment for having written the lyrics of the original piece, while Amsterdam retained the credit (and the publishing rights) for his revised version of the lyric.