We also used to have someone come in once a week to do 'exercise/keep fit/dance ' with the children, perhaps you could develop something and advertise amongst other groups to go and do just that .. it was ggod because she came once a week, and the children got to know her, and we did not have to think about regular music sessions which c an often be forgotton or else staff feel unable to do them.
Chidlren loved them too..

Now we have a gymnastic coach on staff so no worry!

We also have lots of CVs sent and no time to reply to them when there is no vacancy, it also costs us to reply which we can ill afford.....
have you also looked at joining an agency for a varied experience...