The first note is given on the left. Click the staff to write the second note to its right, or type it: the letter, then b for flat or # for sharp (twice for a double, or x for a double sharp), then Enter. Backspace clears it. For example, for a whole step below C, type b b (B flat), then Enter. After a correct answer, Enter moves on to the next step. Click your note again to remove it, or click another line or space to move it. Choose an accidental before placing the note. A half step is the smallest distance between two keys on the piano; a whole step is two half steps.

Piano sound: Salamander Grand Piano by Alexander Holm, used under CC BY 3.0 (trimmed and converted to mono).

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