When does it end?

..."it" being the musical year, as opposed to the calendar year. I ask because I've assembled my ten favorite performances of the year, and I'm wondering when it's appropriate to post. I'm likely to take in a few more concerts before 2008 is through (including one this weekend which I previewed for a local newspaper), so I don't want to close off the list prematurely. One ten-item list recently appeared from a much loved and respected source, and I feel relatively sure he'd be open to having a strong December performance bump one from earlier in the year off the list. Whatever the case, I have my list ready. Okay, Philly-area music groups (these two in particular): make me change my mind.