The original hit version of “All I Do Is Think of You” was sung by The Jackson 5, with lead vocals by Michael Jackson and co‑lead/spoken parts by Jermaine Jackson.

The song was released on Motown in 1975 and became their final charting single for the label before they moved to Epic Records.

In 1990, R&B group Troop also scored a No. 1 R&B hit with their cover of the same song, which is why some listeners today associate “All I Do Is Think of You” with Troop as well.

So if you are thinking of the classic 1970s version, it is The Jackson 5; if you remember a late‑’80s/early‑’90s slow jam rendition, that one is by Troop.