Writing markup in lisp

[Alberto Simões]

Hello

I am trying to use this kind of approach to define instrument names/changes:

\addInstrumentDefinition #"contrabassoon"
  #`((shortInstrumentName . "Cbsn."))

just like it is explained in
  http://lilypond.org/doc/v2.12/Documentation/user/lilypond/Writing-parts


Now, I needed a special instrument name, also like explained in that 
same page:

\set Staff.instrumentName = \markup {
  \column { "Clarinetti"
            \line { "in B" \smaller \flat } } }

The problem is, this \markup{...} stuff is lilypond code, and to use it 
in the snipped above, I need lisp code, right?

Anybody can help to convert this "column" definition to lisp?

Thank you
Alberto

PS: lisp, scheme.. whatever :D