Fingered octaves and tenths

REFERENCE — the hardest double-stop category, named so you know it exists and where to go when you're ready for it. Not a performed skill in this course yet.

What they are

Fingered octaves use 1st and 3rd finger (or another non-4th combination) instead of the standard 1st/4th frame you just learned. Tenths — an octave plus a third — stretch even further. Both demand excellent left-hand flexibility and precise, independent finger control under a stretch that the regular octave frame doesn't ask for.

Why they're REFERENCE here

This course's Intermediate-gate scope stops at the regular 1st/4th octave frame and stopped thirds/sixths — genuinely useful, genuinely common technique. Fingered octaves and tenths belong to a later stage of technical development, well past where this stage is aiming you.

Where to go when you're ready

Ševčík Op. 9 ("Preparatory Exercises in Double-Stopping") is the standard étude reference for finger independence within a double-stop hand frame — it's already in this course's étude ladder (REPERTOIRE.md). When regular octaves and thirds feel secure, that's where fingered octaves and tenths are actually taught properly, with the slow, systematic drilling they need.