Recommendations on the music of Astor Piazzolla

Last night I attended a concert where one of the works was Piazzolla's "Concerto for Bandoneon and Orchestra" (1979). The soloist was Lidia Kaminski, a Polish accordion virtuoso. She played a small "accordion-like" instrument known as the Bandoneon.

The music was Argentine Tango style in three movements. The middle movement played with such grace, finesse and sadness by the soloist, I decided then and there to explore more of Piazzolla's work.

I am looking for LP recommendations of his work, including the one mentioned above.

In addition, I would urge folks to keep an eye out for Ms. Kaminski to be performing in your area. She will make you rethink the accordion.