Impossible (?) to attach bracket to single line staff
Windows 7, GIT commit: ca722c6
1) create score for tambourine and drum set (in that order)
2) try to drag a bracket to the tambourine staff
Result: I can't find a place to release that makes it work
Workaround is to temporarily change staff type to 3-line, attach the bracket, extend it as desired, then change staff type back.