I'm not sure if this is a tacky subject on this site or if I can share files with you all...but I created song request cards for my invitations and can share with any DIY folks who want one less project. You just need to print on cardstock and cut them. My family is from so many backgrounds that I was curious what they might want to hear.
Here's a link to the one I created. Feel free to take it and personalize it:
https://docs.google.com/document/d/1W310htrNbai7pjQanaDVSMxyDuchw3J7UKYUi4MZ8ck/edit?usp=sharing