Ear training
An interval or a chord sounds, you guess, the answer appears at once. The root changes with every question, and whatever you got wrong comes back.
Always hearing from C teaches pitches by heart instead of distances — so every question sits somewhere else. The first attempt is what counts, not the third.
Anotona does this for you
Photograph a page of sheet music or play the melody — Anotona finds the key, engraves the notes and transposes them into any other. Free.
See AnotonaEvery note on this page is computed, not typed in — following the rule that also makes F# major spell its seventh degree E#, not F.