Notes slide across the staff and you name each before it leaves the edge, except the clef keeps shifting underfoot.
Waves of notes drift right to left across a staff. Name the leftmost note by its letter before it exits. Between waves the clef changes, treble, bass or a movable C-clef whose position drifts, so the very same line becomes a different pitch and you must re-read.
Clef Drift trains music literacy by reading notes across changing clefs, including the movable C-clef.
Naming notes as the clef changes between treble, bass and a movable C-clef is the part of sight-reading that cannot be shortcut.
Making the clef move between waves is the original difficulty.
A clef is not decoration; it assigns pitches to the lines of the staff, so the identical dot is a different note under each one. The C-clef is the hard case because it moves — it marks middle C wherever it is placed, which is why violists and trombonists read a staff other musicians cannot.
Clef Drift is a music-literacy trainer for reading notes across changing clefs, including the movable C-clef. It is an original, free browser game built in-house for PlayPendium.