I did think of sub menus too. The only problem with that particular button is that Violin and Viola lessons both would go to the same page. There's no separate page for violin lessons and another for viola lessons. But maybe I can have a "Studio" or "Teaching" button and then have submenus for "violin/viola lessons" and "Pioneer Valley Strings" (which I don't yet have a button for, but is already a page on the site). Hmmmm....
If it's a sub-menu buttom you could have one button with the two choices because sub-menu buttons drop down vertically and can be as wide as you want.
Inger's suggestion is also a good one where the individual buttons go to the relevant section on the linked page.