ledger line
a small line used to expand a five-line staff
treble clef
clef with middle C located one ledger line below the staff
bass clef
clef with middle C located one ledger line above the staff
C clef
a moveable clef that designates middle C on any line
enharmonic equivalent
note names that correspond to the same pitch
half step
the smallest interval between two notes; adjacent keys on a piano
whole step
two half steps; two keys apart on a piano
minor 2nd
one half step up or down; must be named with a different letter
major 2nd
one whole step up or down; must be named with a different letter
natural
an unmodified pitch letter name
sharp
designates a note as being one half step higher
flat
designates a note as being one half step lower
double sharp
designates a note as being one whole step higher
double flat
designates a note as being one whole step lower