If you are a working pianist, you should have an up-to-date business card (no crossed out phone numbers or emails). They are ridiculously cheap nowadays, and it is easily done online with pre-designed templates - there are lots out there to browse through. For conventional business cards, a good starting point is Vistaprint, which has tons of basic templates. It also has a set of 'arts, music and entertainment' designs.
Postcards.com has a set of music business cards.
123Print has a set of 'music and entertainment' business cards.
MOO has fun stuff
PrintBusinessCards.com can be interesting.
The following can be pricey, but are interesting:
A different concept you may not have considered: plastic business cards. They come in clear or frosted versions.
Metal Business cards at PlasmaDesign.
And this one is just fun: