I'm really no fan of singarounds. Not to say they aren't good - for they are, but for my money a jam session where people are playing, singing, telling stories or reading poems in a fun and lightly organised way (i.e. gentle guidance)is the place to be. What matter if people have song sheets, why some people even have music! The joy of music, be it by voice or instrument, the play of language in a poem and the joining in is what's most important to me. So, try not to split it if you can.