Intervals

Two notes played together, usually in one hand but sometimes in both, whose distance is the interval of a 3rd of any quality.

Notation

Additional lines added above or below the staff in order to place very high or very low notes that wouldn't normally fit on the staff.

Texture

A type of texture where the left hand plays the melody and the right hand plays the accompaniment for an extended period of time.

Expression

A type of articulation indicating the player to play smoothly and seamlessly, with the notes slightly overlapped.

Meter

An Italian term meaning "delaying"; an indication instructing the player to decrease speed, often gradually.

Expression

A type of articulation indicating the player to play short and light; notes not held for their full value.

Expression

Also called the damper pedal, it is the rightmost pedal on the piano and used to sustain notes by moving the dampers away from the strings.

Expression

A type of articulation indicating to the player that a given note should be held for its full value or slightly more.

Rhythm

Symbols indicating that two notes are to be played as one with the value equal to their sum.