Yes, Spotify, it was a huge hit during my senior year in high school

In fact, it spent 5 weeks at #1 on Billboard's Hot 100 during February and March of 1968..

From the inside front cover of the 1968 Warren Area High School Dragon yearbook.  (I don't remember my senior year being quite this trippy.)

1968 was a mixed bag, music-wise.  After the 5-week reign of "Love is Blue", Otis Redding's "(Sittin' on) the Dock of the Bay" spent 4 weeks at #1, which was followed by Bobby Goldsboro's treacly, execrable "Honey" for an unendurable 5 weeks.

Best antidote.