If'n I were to record the melody of a choon....is there some way to get "fills" by piano, or guitar between melody lines? Some kinda soloist setting that "listens" and plays during the gaps in a track?

What I'm doin' now is blocking little areas & generating solo fills (using Real Band)...which I'm THRILLED to have the capability to do, but it is a bit time consuming......just wonderin....