A piano roll and sheet music can describe the same performance while making different details easy to see. Sheet music helps a player read the phrase. A piano roll makes the placement, duration and overlap of individual notes explicit. You do not need to choose one for every stage of an arrangement.
The piano notation editor lets you switch between sheet and MIDI views. Start a piano track when you want to work with both.
What a piano roll shows
In a piano roll, pitch runs vertically and time runs horizontally. Each note occupies a rectangle. Its left edge is the attack, and its width represents duration. Two rectangles beginning at the same position sound together even if their lengths differ.
This is useful for a piano chord with a moving melody above it. You can see the accompaniment continuing while the top note changes. You can also spot an accidental overlap between two repeated notes or an unexpected gap before the next chord.
A piano roll does not use the same visual language as conventional staff notation. You identify pitches by their keyboard position and judge timing against the grid rather than reading a notehead and its written rhythmic value.
What sheet music shows
Piano sheet music organises notes on treble and bass staves, with clefs, bar lines and written durations. A player can recognise a melodic contour, a repeated rhythmic figure or a chord shape without inspecting the exact length of every event on a timeline.
A key signature gives context to the pitches. Rests show silence as part of the rhythm. The score provides a reading structure, rather than simply a picture of elapsed time.
The notation still needs musical decisions. A performance that is slightly ahead of the beat might be written with a straightforward rhythm. Writing every tiny timing difference literally can make a phrase harder to read without making it more useful to practise.
Choose the view for the question
Use sheet view when you are asking, “How will I read and play this phrase?” Use MIDI view when you are asking, “Which note starts here, and what is still sounding underneath it?”
Suppose a bass note should continue through four melody attacks. In sheet music, check that the bass duration and melody remain understandable as separate musical layers. In the piano roll, inspect whether the bass event actually reaches the intended endpoint.
Neither view replaces listening. A tidy grid can flatten a deliberate rhythmic feel, and an attractive score can still contain a wrong pitch. Play the phrase back after editing in either view.
Keep practice speed separate from written rhythm
Slowing practice playback helps you learn the part. It does not mean the notation should be rewritten with longer note values. Keep the written pulse and the practice speed as separate decisions so the same arrangement works for a slow rehearsal and a full-speed performance.
Repeat a short passage, check the transition into the next bar and return to the original speed before deciding whether the edit improved the phrase.
Choose the right file for the next tool
MIDI carries pitches and timing into a DAW or another music application. MusicXML carries notation structure into a score editor. A native Note2Tabs project keeps the workspace available for another editing session.
If you are starting from a recording, transcribe the piano audio, then use the two views to check different aspects of the result. For an existing MIDI file, follow the MIDI-to-piano-notation guide.