Co-written and first recorded by Sid Ramin (1965).
Hit versions by The Bob Crewe Generation (US #15/MOR #2 1966), Andy Williams (US #34/UK #33 1967 |UK#9 1999), Al Hirt (US #119/MOR #31 1967).
Also recorded (as “Music to Watch Space Girls Go By”) by Leonard Nimoy (1967).
From the wiki: “‘Music to Watch Girls Go By’ was composed by Tony Velona and Sidney ‘Sid’ Ramin, and was first recorded as a commercial jingle demo for Diet Pepsi, where producer Bob Crewe first heard the song. Crewe, using his own name, then recorded the song under his nom de plume ‘The Bob Crewe Generation’. Crewe’s ‘big-band, horn driven’ recording went to #15 on the Pop chart and #2 on the Easy Listening chart.