What are the most interesting albums you have listened to?

This could mean a unique interpretation or arrangement (such as Wolfgang Brunner's Schubert und die Volksmusik), programming of lesser-known composers (like Susan Tomes' recent Women at the Piano), a recording on period instruments (such as Ingrid Haebler's J.C. Bach Keyboard Concertos), or simply a masterful and memorable interpretation! 

Which recordings stand out to you, and why?