Re: theory stuff help needed
I found this on the web:
"Giocoso (Italian: jocular, cheerful) is sometimes found as part of a tempo instruction to a performer, as in allegro giocoso, fast and cheerful. The same Italian adjective is used in the descriptive title of Mozart’s opera Don Giovanni, a dramma giocoso. "
As far as your other questions, sub. is short for subito, which means suddenly. Most often used in dynamic markings, such as: sub. P - suddenly soft. Molto means "much" or "a lot", as in molto ritard.
Hope this helps,