The pop star and producer have settled nearly a decade of suits and countersuits.
Gaga has already responded to the subpoena in a public statement.
The producer is no longer the CEO of Kemosabe Records.
'Neither Kesha nor her supporters will use the performance as a platform, so the approval has been restored...'
'I'm very sad and sorry to say I won't be allowed to do this...'
'There are no facts to support Gottwald's animus toward women.'
She wrote: 'THIS IS WHAT HAPPENS behind closed doors.'
The 'TiK ToK' singer is appealing against a ruling made last month.
She's reportedly putting her recent troubles aside, to play herself in an episode of a hit musical show.
“His representatives are in regular contact with executives at the highest levels at Sony and this has never come up."