I ask because United Airlines still uses the music (“Rhapsody In Blue”) to advertise its services. Gershwin died over 75 years ago-are his works available to anybody?
Mostly not, for now: Are any George Gershwin songs in the public domain? - Answers
The Gershwin estate and the Rodgers and Hammerstein estate have been instrumental in extending the length of copyright protection in the US.
I see what you did there.
The MOUSE owns that movement.
I think you mean THE MOUSE©®™.