See the attached picture. Just got new music for a performance less than a month away and I don’t recognize the clef. It’s not C Clef. It looks like a treble clef with something intertwined with it. It’s only in the tenor line. It doesn’t show up in any of my music theory books. Anyone with experience reading old music manuscripts with obsolete symbols?
It's effectively an octave treble clef (same as a treble clef with an 8 beneath). Not sure about this specific example, but the clef itself may have come from parts which were originally written in tenor clef but transcribed into treble clef.
That makes sense. Throughout the pages it looks like the flats changed lines along with the bass clef, which sent me down a path to wondering if the bass clef looking like it moved up from the line to the space, along with all the flats, that, like with C clef, the position of F was changing on the staff, which would explain why the position of Bb was changing.
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