Not sure that there really is a 'legal' way to download music without paying for it. Unless you go to bandcamp and an artist has a pay what you want that starts at $0. http://bythebirch.bandcamp.com/releases
FREE download!!! Major Key Chord Chart ♫ A very handy reference for all musicians! This chart shows the chords for all the major key signatures. ♫ Give this handy chart to your students as a reference sheet, use as a resource when teaching major keys and chords or print off, laminate and post on your music room wall!