There is an old time tune dating back to the Civil War called John Brown’s March, which is fun to play. However, this version, named Sweet John Brown’s March, is quite lovely and can be played a bit slower than a march.
The guitar TABs are simple and straight forward for this G tune. Here are the TABS along with chords and notation. Sweet John Brown’s March Gtr TAB
Get out your guitar and give it a whirl! You’ll be glad that you did.