Sorting Algo

We all listen to music. We categorise them according to the artist / band. We also categorize them according to the language of the lyrics (eng / hindi / etc) .We categorize them according to the era in which they were composed. We also have a 'favourite' folder. But at the end we select some few songs from each category and make and call it as 'my playlist'. So is it efficient, nah !!! I think we can do something else...i.e categorize them according to the mood as each song brings authentication to some particular type of mood. For e.g. we should have song folders like romantic, party, fighting spirit, gazal and many more. So if one wants to listen songs then he can select songs that suits his mood. I understand this sorting might create some new problems, i.e one will have difficult time in knowing whether he has some particular song and also in exchanging songs with friends. For this sorting to be successful, ppl would need to have a training eye which is difficult to achieve. It would be a big change in approach for ppl and ppl hate to change. But this sorting might help some mavericks like me!!!!