Systemic approaches to Music:


T. Winograd. Linguistics and the computer analysis of tonal harmony. 
Journal of Music Theory, 12(3):2--49, 1968
(Reprinted in M.A.K. Halliday and J.R. Martin (eds.), Readings in
Systemic Linguistics, London: Batsford Academic, 1981, 257-270.)
(Reprinted in Stephan Schwanauer and David Levitt, Eds., Machine Models
of Music, MIT Press, 1993, pp. 113-153.)

Steiner, Erich 1986. Review: Lehrdahl & Jackendoff.
Towards a formal theory of music. in: LANGUAGE
SCIENCES, 1985 Vol. 8 No.1.

Steiner, Erich 1988. Language and music as semiotic
systems. in: Benson/Greaves/ Cummings. eds. 1988.
Linguistics in a Systemic Perspective. Amsterdam :
John Benjamin.

Theo van Leeuwen (1999) Speech, Music and Sound. Macmillan.

Danielewicz-Betz, Anna 2000 "Variation in (silent) discourse and
music". In Eija Ventola (ed.) Discourse And Community. Doing
Functional Linguistics.  Language in Performance 21. Tubingen: Gunter
Narr Verlag.

Callaghan, Jean  and Edward McDonald. 2002. Expression, Content and 
Meaning in Language and Music: an integrated semiotic approach. 
in McKevitt. P. et al. (eds) Language, Vision, Music. Amsterdam: 
Benjamins. 205-230.

Edward McDonald. 2002. Through a Linguistic Glass Darkly: a critique 
of theories of music from a social semiotic perspective. in Stevens, 
C. et al. (eds) Proceedings of the 7th International Conference on 
Music Perception and Cognition, Sydney 2002. Adelaide: Causal 
Publications.

Callaghan, Jean & Edward McDonald. 2003. The Singer?s Text: Music, 
Language, and the Expression of Meaning. Australian Voice. Vol. 9