The sun is about to evolve from a white dwarf to a red giant. Mean while. Scientists are covertly trying to mutate humans to survive the transition. I am pretty sure it waa made for TV.

Sounds a bit like

The Outer Limits
Episode: Music of the Spheres

A scientist records the first extraterrestrial transmission
From an alien race. Young people hear music in it. The
Music becomes addictive with the youth. The scientist
Discovered the music can mutate dna.At first he believes
Its an alien plot to take over the world, but he later finds out
The sun is undergoing a permanent change. The sun's
Out put of radiation would dramatically increase and only
Those who underwent the change brought on by the
Sound/music (the youth) would survive.
The aliens were trying to save the human race.