I tend to collect a lot of sheet music and I'm having a hard time organizing it. Right now I use a series of folders in dropbox but it seems laborious and difficult. There has to be a better way to do this. Almost all documents are PDF and are currently organized as shown below. It means I have duplicates of songs possibly in the ALL SONGS and FAVORITES or PRACTICE. I use GoodReader to display the sheet music on my iPad Pro. Is there a better way to do this?