I put together a collection of children's songs to use in early childhood settings (suitable for 0-5 year olds).
I bought a binder and A-Z folder tabs (Marbig brand) and I laminated each song and filed it according to the song title. I keep the index of songs at the front of the folder. In the PDF file you will see that there is a page with a letter (or letters, according to the index). I didn't print those pages, but they are there to make it easier for you to file the songs into the tabs.
You could create your own index and continue to add to the index as you collect more songs.
Hope you like it! :-)