Rated songs with density following rating smartlist

This smartlist selects randomly up to 1000 songs. Of these 1000, there will be a higher density of songs rated 5, a bit less of rated 4, and some rated 3. The remaing 25% will be of unrated material. Finally it will remove songs with matching artist and title (name). You can also use number of songs instead of percentage.

[media type]=[audio] ~mix=1000,25%,{[Rating]=>4},25%,{[Rating]=>3},25%,{[Rating]=>2},25%,{[Rating]=<1} ~nodup=[Artist],[Name]