How can I transpose a quote in Lilypond?

Question

I'm transcribing a piece that has a section where one instrument doubles another an octave lower. I'd expect something like this short example to work:

oboe = \relative c' {
  \clef treble
  | c g a b | c e d c |
}
\addQuote "oboe" { \oboe }

bassoon = \relative c {
  \clef bass
  | e d c c |
  | \transpose c' c { \quoteDuring #"oboe" { s1 } } |
}

\new Staff \with { instrumentName = #"Oboe" } \oboe
\new Staff \with { instrumentName = #"Bassoon" } \bassoon

However, the \transpose command seems to be ignored, and the output is:

The desired output is:

How can I tell Lilypond to move the quote down an octave?

Answer 1

I've now realized that I put the transposition in the wrong place. The \transpose command was only applying to the contents of the \quoteDuring (i.e. s1), not the quoted music itself.

I found this link, which gave me the very simple idea of creating multiple quotes:

oboe = \relative c' {
  \clef treble
  | c g a b | c e d c |
}
\addQuote "oboe"  { \oboe }
\addQuote "oboe," { \transpose c' c \oboe }

bassoon = \relative c {
  \clef bass
  | e d c c |
  | \quoteDuring #"oboe," { s1 } |
}

\new Staff \with { instrumentName = #"Oboe" } \oboe
\new Staff \with { instrumentName = #"Bassoon" } \bassoon

This works as intended.