I finally sat down and figured out a way to add concertina tabs (as Gary Coover uses in his wonderful books) in MuseScore. Maybe this is old hat for the rest of you, but I haven't seen it described before, so I went ahead and made a quick howto video. If anyone knows of a better/easier way to do the same thing, I'm all ears!   The TL;DR version is "Add lines from the Palette; edit them in the Inspector".       Lockdown_Waltz.mscz