Theoretically, four. Anything more than double sharps and flats is ridiculous. In practical terms, it is rare to find a black key referred to more than the next highest or lowest white key. D sharp and E flat, for example are the same key on a piano.
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An enharmonic note is a note that has two names but have the same fingering
A quarter note has a solid black note head and a stem. If the stem goes up, it is to the right of the note head. If the stem goes down, it is to the left of the note head. The stem is just a line and does not have a flag or beam attached to it.A quarter note is a filled in note (it is black, not open like a half note). It has a stem, but no flags.
Enharmonics
cleft
how many rhythms can a dotted quarter note , quarter note and Pair of eighth notes