Smooth Operator by Sade and Ray St. John (1982).
Seems like the saxophone found its way into many many songs in the 1980s. Careless Whisper, Baker St, and Smooth Operator is another very famous one.
Played on tenor saxophone in original, I list the notes for alto sax below the video. To play the same notes as tenor, you’ll be starting on low B. Or you could take it all up an octave.
Notes for alto sax:
B C# D E F#
A B C# D C# B A B