Pianists are very weak in combat, which makes completing the main quest a bit of a trial. However, the ability to gain a vast fortune makes up for that physical weakness. A Pianist's best bet would be to surround him/herself with powerful pets (this is where their high Charisma comes in; it allows them have more allies than most other classes). Don't leave your piano lying around in towns, as it will be lost forever after a number of in-game hours have passed.