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Morning all!

Please can anyone help with these? In both cases I understand the definition but not how they parse.

19a: Back pain - after onset, probe back (7)
LUMBAGO?

35a: What is thematic in mathematical part of song? (6,5)
MIDDLE EIGHT?

TIA

Thanks mattrom. Another bloody deletion! Is it any wonder that I detest that type of clue?

Also, the middle 8 bars in some song structures is often where you get the main theme