William E. May, better known as Billy May (10 November 1916 – 22 January 2004) was an American composer, arranger and musician. He died of heart failure at the age of 87 in his home in San Juan Capistrano, California.

May's charts often featured brisk tempos and intricate brass parts. One distinctive feature of his style is his frequent use of trumpet mute devices; another, a saxophone glissando, is widely known as his "slurping saxes". However, May was also an accomplished writer in slower tempos, sometimes using string arrangements. Good examples of this aspect of his work include his brass chart for "These Foolish Things" on the Cole album Just One Of Those Things and his string arrangement of "April In Paris" on Sinatra's Come Fly With Me album.

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