[piotrkaminski]

Indeed -- curse you, irregular standard note structure!

[lloeki]

mnemonic:

C D E F G A B [C]

is

do re mi fa sol la si [do]

mi (E) and si (B) end with "i" and are the two ones that are half a step away from the next ones.

[viraptor]

Only in "fixed do" version though, because we can't make music notation too easy or consistent...