Names the interval between two written notes by their letters and octaves: C4–F#4 is A4, C4–Gb4 is d5, C4–E5 is M10. Order does not matter; the interval is measured from the lower note. Notes without an octave are taken in octave 4.
A4
d5
M10
Note name, e.g. "C4", "F#", "Bb3".
"C4"
"F#"
"Bb3"
Note name.
if either name is not a note.
Names the interval between two written notes by their letters and octaves: C4–F#4 is
A4, C4–Gb4 isd5, C4–E5 isM10. Order does not matter; the interval is measured from the lower note. Notes without an octave are taken in octave 4.