GOOD QUESTION
I use a couple of different tune themes, in multiple variations, for transitions and vamps between melodies.
I don't know why, but they just fit-in and fill time and seem to be able to connect into anything...and it gives me a chance to think where I'm going.
Blow the Wind Southerly
Wildwood Flower
Coca Cola Song
Jamacan Farewell
Buffalo Gals
Sweater Song by Wheezer
Sincerely,
Gargoyle