Variable equivalent in Scheme

[Freeman Gilmore]

If:
       traLaLa = { c'4 d'4 }
How would I write this in Scheme?
       #(define traLaLa  ?)

Trying to make it work in:
traLaLa = { c'4 d'4 }
#(define newLa (map ly:music-deep-copy
  (list traLaLa traLaLa)))
#(define twice
  (make-sequential-music newLa))
\twice

Thank you,
fg