Is there any well-known melody that only contains the notes C, G, D and A? I'm learning to play the cello, so far practicing only playing on open strings and would love to be able to play a melody.
Not really. The only thing similar to using only those open strings - that I can think of - is a tune based on only the interval of a fifth - any two adjacent strings on the cello, but try the
D - which is the "Winkie Chant" of the flying monkeys from the Wizard of Oz. I couldn't find any music notation so this description must suffice...
...the tonic (first) could be the
G and the dominant (fifth) would then be the
Title Over the Rainbow: The Wizard of Oz as a Secular Myth of America Author Paul Nathanson Publisher SUNY Press, 1991 ISBN 0791407098, 9780791407097