I'd really like to learn a second instrument but which?

The Harmonica is wonderful. I've played violin; I find the electric ones are too strident sounding for me. Zeta Elecs. are one of the best makes. Some great players are Jean-Luc Ponty,'The Great Kat', and Mark Wood (album Voodoo Violins)/ The cello is a very sombre instrument..a bright yellow one would be cheerier! (you can order proper finish colors and have one redone..)/ Clical guitar is awesome/ Accordian perhaps?/ how 'bout Pan-pipes?/ Saxaphone?/.. Listen to Miles Davis 'A Tribute To Jack Johnson,1970 (later called 'The Complete Jack Johnson Sessions',2003); and you'll want to take up the trumpet!