Question on glue to repairing Piano key board

I have a question on what glue one should consider to use to carry out minor repair to piano key board. My problem is that one of the black keys on our 60 year old piano has come unstuck and fallen off and needs regluing. It would appear that it would have been originally glued with animal glue.

I look forward to any advise on carrying out this repair.

Cheers Malcolm Eaton