Kevin McHale and Jenna Ushkowitz say revisiting Cory Monteith and Naya Rivera's performances for their 'Glee' rewatch podcast has been "healing." ...

Kevin McHale and Jenna Ushkowitz talked about how difficult it can be to rewatch the series that catapulted their careers.

The actual 300th musical performance features Amber Riley, left, Naya Rivera and Heather Morris covering Adele's "Rumor Has It"/"Someone Like Me" as part of McKinley's New Directions rival glee club.