NotePlayMusicApproach the same C from both staves
Middle C is one piano key, C4. On a treble staff it sits on the first short ledger line below bottom-line E. On a bass staff it sits on the first short ledger line above top-line A. The clef changes where the note is drawn, not the pitch of this C.
Start at a line you already know, then count one letter per staff position. From treble bottom-line E, step down into the D space and onto the C ledger line. From bass top-line A, step up into the B space and onto that same C.
Two different approaches to the shared key
Trace each phrase from a known staff line. Their final notes are drawn in different places but land on the same middle-C key.
What to notice: The short line passes through C in either clef; the long staff lines do not move.
What is the final note of the descending treble phrase?
Keep counting through the ledger line
A ledger line is a short extension of a five-line staff, not a new clef or a barline. Spaces still alternate with lines beyond the staff. Below treble, D sits in the space just above middle C, while B sits in the space just below it.
Above bass, B sits in the space just below middle C, and D sits in the space just above it. Use the same alphabet around C, but check the clef before deciding which octave a note belongs to.
Space, ledger line, space
Both phrases cross middle C. The note heads on either side occupy spaces; only C sits on this first ledger line.
Name this bass-clef note one staff step above middle C.
Same letter does not always mean same key
Treble middle C and bass middle C refer to one pitch, C4. But a higher C on the treble staff is C5, a different piano key one octave up. Keep track of both the clef and the note head’s exact staff position.
If a note seems to jump an octave when you switch clefs, return to the two middle-C ledger lines and compare the pitch before continuing.
One letter in two octaves
The first C is below the treble staff; the second C is inside it. Their names match, but their pitches do not.
Two Cs on the keyboard
Middle C (C4) and the next C (C5) share a letter but are two separate keys.
Compare their positions; the higher key sounds one octave above middle C.