Catalogued in RISM as “Siroe (Excerpts); Manuscript copy; B-Bc 12509” by Anonymus. RISM 706001200
Unresolved
'Al tuo sangue io son crudele' agrees, with the same words, with the opening of the aria (incipit 1.1.3) in Siroe excerpts under Traetta's name, but the five-bar search also returns copies under Cacace, Ebhardt, Geisler and Hasse, so whose setting it is stays open.
Attributed copies compared (0 of 3 encoded incipits match):
1.1.1 Recitativ. · T · “No voglio che mora” · no matching incipit among the attributed copies
'4-8-D4,B8B6B'C/8C,G-6GG4'C8C,B/No encoded incipit matches this one.
1.2.1 Aria. Andante con moto · vl 1 · no matching incipit among the attributed copies
''8{GGGG}{GGGG}/{FFFF}{FFFF}/{nFFFF}{FFFF}/No encoded incipit matches this one.
1.2.2 · A · “Al tuo sangue io son crudele” · 5 of 11 pitches agree (too short to count)
'=16/2.G{8BG}/4FF-''D/8{(CDF)}2E4'nF/EE=16/2.'G{8BG}/4FF-''D/qq6'AB''Cr2.D4'nF/EE-E/Catalogue data and incipits come from RISM (Répertoire International des Sources Musicales), CC BY 4.0. Incipits are rendered with Verovio. Source and data: https://github.com/aaymeloglu/rism-attributions.