This patch fixes compilation with GCC-10.

diff -dru a/source/audiolib/include/music.h b/source/audiolib/include/music.h
--- a/source/audiolib/include/music.h
+++ b/source/audiolib/include/music.h
@@ -38,6 +38,7 @@
 
 #ifdef __linux__
 #include <vector>
+#include <string>
 
 typedef struct
 {