What series (that never had a musical episode) would you most want to see create one and what would be the most remembered song?

Geek Question of the Day: Musical episodes can be fun diversions from an otherwise non-musical story, so today we wanted to ask you; What series (that never had a musical episode) would you most want to see create one and what would be the most remembered song? Any source that hasn't already created a musical episode is fair game!

Image source: http://bit.ly/2OqWOjt