Songs To Be Performed on Oscar Telecast By...

Pharrell will perform "Happy" from Despicable Me 2.

Idina Menzel will perform "Let It Go" from Frozen.

Karen O will perform "The Moon Song" from Her.

U2 will perform "Ordinary Love" from Mandela: Long Walk to Freedom.

And those are the only songs that are nominated.  No one else.  None for Gretchen Wieners.