Free Sheet Music
ABC Notation - Free Sheet Music Files
To obtain free sheet music for your Hall Crystal Flute, you might like to check out the following links. The first link describes ABC notation and supplies links to folksongs from all over the world. There are about 9,000 tunes in their database. The tunes found here will be public domain and are completely free and legal. The main website for all things relating to ABC notation is: http://abcnotation.com/
My Favorite ABC Player/Printer for Windows
To use ABC notation, you first download the text based music files (free) and then use a software program to play them or print out sheet music.
ABC Player/Printer for iPad or iPhone
For iPhone, you can use Tunebook. There is also an iPad version. You can find Tunebook at: http://www.jhlabs.com/tunebook/ (small fee)