Formed in 2007 as a charter member of CASA's Contemporary A Cappella League, Two Weeks Notice was a group of professionals by day and "organized nerd-singers" by night. Over their 7-year history, they made multiple appearances around the Metro Detroit Area, singing everywhere from private parties to full-fledged concerts. They also released a series of iTunes singles between 2012 and 2014.
This landing page at the twoweeksnotice.net domain is a quick tribute to the group with links to audio and video clips.
More information about the group can be found at their Wikipella page.