If you can sing- you must be enjoying the ride and things must be going well enough in that you can find the breath to sing. I have a problem coming up as I used to play in a pop group in my youth and changed over to folk as a solo player on a 12 string. My co-rider on the Tandem found out about this and he used to play a Guitar many moons ago and he has been practicing. Now how do we stop falling off the tandem without damaging the guitar that is bound to get out on some of the charity rides eventually?