Its time you invest in a truly HIP endeavor. The harpsichord and its brother the clavichord are calling. Will you resist that call? You may not be able to. Not unless you take up the Lute. So do yourself a favor, and go HIP or go Renaissance.
Last edited by clavichorder; Sep-06-2012 at 08:27.
I agree Krummhorn that organ would probably be the most streamlined learning experience for you. I would say however that I would be slightly nervous about learning organ on top of piano just incase the two keyboard techniques got in each others way and diminished mutually as a result... Not 100% sure, just a thought (what do you guys think?) or maybe you want a new main instrument.. idk:P
Personally assuming you wanted to keep your piano intact I would go with something in the string & bow family.. Probably either violin or cello. Both of the 2 are very essential to the backbone of the classical repertoire and also provide (in my humble opinion) a broader variety of satisfying solo works.. But the decision is yours! What do you like the sound of most? Where do you think you'd have greater natural affinity? You may find you get a better answer if you give us a little more of you:P
Viola de Gamba is supposedly a great choice for those inexperienced with stringed instruments, provided you can get your hands on one. I don't know anything about the learning curve, but its said that once you are reasonably competent at it, just about all the repertoire available is accessible to your skills. Not too many interval leaps. And when you play in an ensemble, you can participate in performing music of the English from 1500 to 1680 or so. There's a lot of good repertoire in there.