An example of using symbols that is maybe not as cool as the ones you’ve listed is in the Talvin Singh album “OK”. He has so many collaborators, several of which appear on more than one song in random combinations, that he comes up with a symbol key, with one symbol for each musician on the album, including him. (There are 26 altogether.) Then there’s a chart with each song name and a bunch of symbols next to it, representing the people that played on each song.

The 4 Hero album “Two Pages” has a song with the title in some weird symbols. I dunno what they mean. The CD itself is covered with symbols from the same “alphabet.” Then inside the booklet there is a separate listing for each song with the song title, a few weird new age-y quotes, the writing credit, and the playing credits. The song with the title in symbols has its information written in the symbol language, of course. Then the track after that is called “De-Sci-Fer” and features a guy’s voice played backwards. I’ve never bothered to flip it around. The album itself is very new-age/spiritual/extraterrestrial themed, with song titles like “Planetaria” “Wormholes” “Pegasus 51″ etc. I imagine the symbols are supposed to be an alien or spirit language.

That Aphex Twin song that you talked about that had his face imprinted in the spectrograph has symbols for a name, of course.

The Earth, Wind & Fire album “That’s the Way of the World” has symbols all over the CD, booklet, and case. They look like heiroglyphics, although the AMA logo is there as well. They’re probably just there for decoration. EW&F were really into mysticism.

In rap, there is naturally a wealth of lyrical gimmicks along the lines of the counting thing you’re talking about. There’s a Jay-Z song called “22 Two’s” for instance where he says two/too/to 22 times, naturally.
There’s an Eminem line in some song, maybe a bootleg, where he has something with the letters A-E that I remember thinking was very clever.