Choose a music theory exercise to practice:

Identify the names of notes that appear on the staff.
Clef:
Build intervals on the staff.
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Identify intervals on the staff.
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Build triads and 7th chords on the staff.
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Identify triads and 7th chords on the staff.
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This drill gives you a key and a chord function — figure out the triad or 7th chord needed, and build it on the staff. Use the advanced options to try more difficult functions: secondary dominants, borrowed chords, augmented 6th chords, and more.
Clef:
Identify the notes sliding across the staff before they disappear into oblivion! This is a very effective way to quickly learn the grand staff once you have gained a general familiarity with it.
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Notate rhythmic patterns based on what you hear using whole notes, half notes, quarter notes, and eighth notes, depending on difficulty level.
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Tap out the rhythm displayed on the staff.
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Identify the key signature that appears on the staff.
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Build scales on the staff.
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Identify the notes on the staff by clicking the proper key on an on-screen piano keyboard.
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Identify the notes on the staff by clicking the proper fret on a guitar fretboard pictured on the screen.
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Identify the notes on the staff by clicking the proper point on the fingerboard pictured on the screen.
Instrument:
Listen to two notes in sequence, then identify the interval between them.
Listen to a chord, then identify the type of chord that you heard.
Listen to a scale, then identify the name of the scale that you heard.
Listen to a chord progression, then identify each chord that you heard.
Listen to a single note, then identify the name of the note.
Listen to a short chord progression to establish a key, then a single note from that key. Identify the scale degree of the note. This is also known as "functional ear training."
This exercise combines the "Intervals" and "Scale Degrees" exercises. In this exercise, you will hear a short chord progression followed by two notes. You must identify the major scale degrees of the two notes relative to the key established by the chord progression as well as the interval between the two notes.
Listen to a short chord progression followed by a short melody, then identify the major scale degree of each note in the melody.