You can get a Fall Arts Pass from the Philadelphia Chamber Music Society for $50. It would normally cost you $100.
The deal will entitle you to you can sit back at one of five intimate, Center City venues and enjoy up to 21 concerts by international and Philadelphia-based artists.
Since 1986, the music society has struck chords with its audiences through classical and jazz performances by string soloists and quartets, wind musicians, pianists, singers, and more. Whether you prefer the dulcet sounds of a violin or the melodic notes of a soprano, you'll revel in harmonious bliss for the rest of the year (through December 2012) -- and whistle all the way to work.
The deal is being offered through LivingSocial, so you'll need to have an account with that company. That means providing them with some personal information including your e-mail address.