Music and programming

When i program i always listen to some music. What i have noticed is that there is a relationship between productivity, the type of program (big project or just a simple script), the language i write it and the type of music.
I listen a lot to greek music. My favorite artist is Nikos Makropoulos (’Ypopto to aisthima sou’, ‘Katastasi ektaktou anagkias’ and ‘Ypo to miden’ are some of his best songs) but that doesn’t mean that i don’t listen to other greek quality singers like Panos Kiamos and Nikos Vertis. All of them are the so called ‘dog’ singers (greek expression).
Depending on the mood i also listen to house, reggae, rock and some times even electrofunk. What i can’t listen to are some types of metal like death metal and goth.
So, let’s denote productivity as P, the type of program as T with 5 meaning a big project and 1 meaning a simple script, the language as L and type of music as M.
L has the following values:
5: C
3: Assembly (btw, at&t syntax rules, intel sucks )
2: Java, Perl, Shellscript
1: Others (C++, …)
M has the values:
4: Greek music
2: Other
And the magic equation is

P = (T + L) * M

Some times i feel that the values of the variables can change depending on some other factors (e.g. weather, programming for fun and pleasure or for university, …) and especially M. Maybe some time i’ll find a new equation with more variables that gives a better result…