Co-written and first recorded (as an instrumental) by Mike Sharpe (US #57 1967).
Other hit versions by Classics IV (US #3 1967 |UK #46 1968), Atlanta Rhythm Section (US #17 1979).
From the wiki: “‘Spooky’ was originally an instrumental song performed by saxophonist Mike Sharpe (Shapiro), written by Shapiro and Harry Middlebrooks, Jr., which first charted in 1967 hitting #57 on the US pop charts.
“The best-known version was created by The Classics IV when guitarist James Cobb and producer Buddy Buie added lyrics centering on a ‘spooky little girl’. Cobb (along with bandmates Robert Nix and Dean Daughtry) later became part of the Atlanta Rhythm Section, re-recording and charting ‘Spooky’ again in 1979.”
Classics IV, “Spooky” (1967):
Atlanta Rhythm Section, “Spooky” (1979):