Code Golf: Musical Notes

Answer 1

C89 (186 characters)

#define P,putchar(
N[99];*n=N;y;e=45;main(q){for(;scanf(" %c/%d",n,n+1)>0;n
+=2);for(;y<11;q=y-(75-*n++)%7 P+q-4?e:79)P*n&&q<4&q>0?
124:e)P*n++/4>>q&&q?92:e))*n||(e^=13,n=N,y++P+10))P+e);}

Half-note support (+7 characters)

#define P,putchar(
N[99];*n=N;y;e=45;main(q){for(;scanf(" %c/%d",n,n+1)>0;n
+=2);for(;y<11;q=y-(75-*n++)%7 P+q-4?e:v<4?79:64)P*n&&q<4&q>0?
124:e)P*n++/4>>q&&q?92:e))*n||(e^=13,n=N,y++P+10))P+e);}