I've recently noticed that there are a lot of excellent songs that feature counting quite prominently in the song, e.g.
Aquarius - Boards of Canada
Count 5 or 6 - Cornelius
100 Bars - Spiritualized
Pi - Kate Bush
5-4-3-2-1 - Manfred Mann
Space Oddity - David Bowie (a little less prominent in this one)
Counting song from Sesame Street
What other ones are there?