Adam Lambert sings 'Rockstar' on Glee - Full Performance Video

Watch the full performance video of Adam Lambert performing "Rockstar" by A Great Big World on Glee: "New York, New York" on FOX.

I just wished more viewers were watching Glee to witness his raw talent.

Glee's ratings fell to an all-time low on Tuesday and only had 2.6 million viewers.

Bad timing for Adam. He should have agreed to join Glee when it was on top.

Kurt and Elliott perform "Rockstar" by A Great Big World

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