If a caller get a dance from a book that book should say what tune you need, and this info should be passed to the musicians. If you find it on Youtube you can pass the link to the musicians.

Is anyone training your callers in programme planning?

Do you repeat many dances or is it a new programme each time. I think the band would benefit from a chance to know how a dance and tune go together. There are points in a dance where the tune needs to be straightforward (obvious phrasing) and points where dancers appreciate 'interesting'. Not saying that you do this, but I went to a PTA dance where the band were enjoying a tune but most of the (non)dancers were finding it hard to hear the phrasing - a different group would have enjoyed the fun in a simple dance.