The QWERTY keyboard already has the right shape: rows of keys, columns of keys. What if each column became a chord, and each row became a strum lane? That's keystrum — a browser-based instrument that maps your keyboard to six chords. No external instrument, no samples, no install. Pure Web Audio. The layout Am C Em G Dm F ┌──────┬──────┬──────┬──────┬──────┬──────┐ E4 │ 1 │ 2 │ 3 │ 4 │ 5 │ 6 │ ← highest pitch ├──────┼──────┼──────┼──────┼──────┼──────┤ B3 │ Q │ W │ E │ R │ T │ Y │ ├──────┼──────┼──────┼──────┼──────┼──────┤ G3 │ A │ S │ D │ F │ G │ H │ ├──────┼──────┼──────┼──────┼──────┼──────┤ D3 │ Z │ X │ C │ V │ B │ N │ ← lowest pitch └──────┴──────┴──────┴──────┴──────┴──────┘ Enter fullscreen mode Exit fullscreen mode Each column is one chord. Sweeping a column top-to-bottom — say 2 W S X for C — fires four notes in fast succession. That's a strum. Strum detection The trick is detecting intent . A user pressing 2 W S X simultaneously is one event; pressing them spread across 200ms is another.…