You can search JW for solo with band in the drop down menu. A few years back I did "All is calm" by R.W. Smith. It had a solo that was written for multiple parts. I ended up splitting it up for two soloists just to feature more kids. I know I have done more like that that have a solo written out for Bb parts, Eb, parts, etc. but I can't really remember titles off the top of my head. If nothing else, you could always transpose a solo part.