This music / theme is called.. "Magneto's Ressurection".. it plays right after the mid-point of "The Uncanny X-men; chapter one; the story of Diana of Themiscrya".. after Magneto's assumed.. boo hoo hoo.. death... when Magneto (Daniel Day Lewis) levitates himself out of the unmarked grave he was buried him... he then walks across a dusty, dry landscape to wear Lorna Dane (embeth davidts junior), his third child, is tending flowers... Magneto takes off his mask.. Lorna Dane sees him.. runs over to him and falls crying uncontrollably on his chest.. then the next image is of Magneto and Lorna Dane (embeth davidts junior), father and daughter, walking side-by-side to an area .. a small-crater area... where .. Toad (Bob Hoskins) is residing... Toad sees them both .. and he excitedly high-hops it off to Quicksilver (Ben Affleck) and Scarlet Witch (Kate Moss).... both the latter actors can come up with the manner of their first meeting of Magneto (Daniel Day Lewis) after his presumed death.. then... all five people... are in a Magneto magnetic-force levitation bubble in the air.. hovering.. flying toward Genosha.... Magneto, Lorna Dane, still crying, Scarlet Witch and Toad both of them with big ear-to-ear grins on their faces.. Quicksilver looking driven, grave, serious (This is NEVER happening again)....

https://www.youtube.com/watch?v=71ogR-3rxy0