It's called "Avant-garde" and a lot of people will probably think it is weird unless done in a proper venue, like a movie.
Otherwise more people would probably listen to this kind of music. After-all he did end up somewhere with his paintings like in New York or somewhere and one of his albums (which is really weird) ended up in the top 500 albums made (according to some) - "Trout Mask Replica" - of all albums ever done.
Early days:
http://www.youtube.com/watch?v=HyZtlgnu9nw Even Ry Cooder played some with him.
Later it was even this:
http://www.youtube.com/watch?v=Vb9AU6_pTv4 http://www.youtube.com/watch?v=iqRHr5pEIFUsingle track of the name of the album.
Nowadays it is just beat the bass-drum on the beat and trance music, I guess, who knows. Creativity ends up ending up at the medium, less resistance.
And then there is other music that has been done, but anyone usually going out there (wherever that is - outer space I guess) too much, ends up waiting years to finally be recognized if at all.
Just one of a few over the years, perhaps the strangest one to some with the way he did music.
Depending on perhaps where you live and how you were brought up.
Old blues music can be similiar in that respect.
In the end, most people can not play his music, or anyone like that, and sound like he did (or she - whomever).
(if they wanted to anyway).
Where else can you hear a song with him and Zappa with words like "I woke up with beer and puke in a banana bin".