I am severely limited in the portion of my music collection which I can transfer to my mp3 player. As such, I would like to add a random selection of songs to my mp3 player but I would like to ensure that I have some balance. Is it possible to create a playlist consisting of random songs within each genre but have the number of songs selected from each genre be based on the total number of songs in that genre? For example, if I have 100 post-rock tracks and 50 ska songs, it would select something like 10 random post-rock songs and 5 random ska songs. Thanks in advance.