I think it's a fair approach. You are making sure that any of N songs isn't played more often than every N/2 songs. Though depending on the size of your library you could as well play them strictly round robin and wouldn't notice any difference.

One variation of your method might be to use something like(rand()**3)*($N*.95). This makes it possible but highly unlikely for a song just played to play again quite soon. rand()**3 strongly favors songs at the beginning of the list

Personally I use a jukebox program where I put the songs in directories that were given different weights. If there were directories a, b and c, the files in b would be played 2 times as often as the songs in dir c, and the songs in a 3 times as often. The ordering is simply alphabetical

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