Itunes has a column browser   which has the effect of filtering and sorting views of music objects. Values are selected rather than typed. it makes the function of curating content much simpler eg checking whether tracks of a given album/ artist have been added . i am finding i am regularly using the web browser's search function to curate playlists which is far from ideal the ability to sort by [music] tag alone would go along way for [music] playlists.