Here is a fiddle arrangement of Twinkle Twinkle Little Star, played by brothers Zane and Tristan. Older brother Tristan is playing an improvisation on the melody and I am accompanying them both on guitar. I like to get siblings playing together if they are interested in that. It adds interest for them and in these two boys instance, they are practicing something they really like doing. Tristan is very interested in improvisation. Sometimes I call it “applied theory”. You have to get acquainted with the chords and how they move to be able to fit into what is going on. Variations come as one gets comfy with simple harmonization that fits.
Enjoy!