I hear this song occasionally on Q107's "Psychedelic Psunday." Its so weird and trippy, you have to wonder what these guys were smoking when they recorded it. According to allmusic, Focus is a Dutch band that was formed in Amsterdam in 1969 (hence the access to the good drugs). "Hocus Pocus" actually cracked the US pop charts in 1973, reaching #9 (#20 in the UK).
If you like "heavy guitar riffs, neo-classical organ, and Alpine yodeling," then this song is for you.
Focus - Hocus Pocus.MP3