It would be really helpful to have the playlist Key and the date the song was added to the playlist displayed to the right of the name in the playlist song view, and to be able to sort by either value.

Often, when we're making a set list, we want to avoid putting songs together that are in the same key, so having that display on the list itself would make it much easier to create a set-list.

And when practicing, it's sometimes helpful to practice newly added songs first or practice the oldest ones, so sorting by date added would be great.