A Musical Note: is a single pitched sound.
Scale: A set of musical notes put into an order
Key: The pitch at which the a scale is.
Interval: The distance between two notes
Semitone: The smallest distance between two musical notes (americans call it half step)
Tone: Two Semitones (the second smallest distance between two notes. Americans call it whole step)
Minor third: Three Semitones ( The important interval in a minor chord)
Major third: Four Semitones (The important distance in a major chord)
Perfect Fifth: Seven Semitones
Major scale: Tone, Tone, Semitone, Tone Tone Tone Semitone
Root note: Name of a chord or the musical note where you start when building a chord
Chord: Three or more notes played at the same time.
Major Chord: Root + Major third + fifth
Minor Chord: Root + Minor third + fifth
Homework: To be able to play every chord and name it in the key of C Major