> { \transpose ds c \melody } % "ds" because "ef" yields a weird key
Thomas already posted the correct transposition, but just to emphasize:
If I understand what you want to do, the arguments of \transpose must be
inverted. You want to transpose from c to e flat:
\transpose c ef \melody
The order in your snippet transposes from d sharp to c, i.e. a melody in
\key c \major is transposed to b double flat or a major.
Joram
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