what is the tune at played at the beginning of calling catch 22

The tune at the beginning of Catch-22 is most likely “Basecamp at Dawn,” the opening track on the 2019 series soundtrack by Rupert Gregson- Williams and Harry Gregson-Williams.

Why this fits

• The official soundtrack listings for the series place “Basecamp at Dawn” first in the album order.

• Tracklist sources for the show also identify it as the opening cue from the score.

One caveat

If you meant the 1970 film rather than the Hulu miniseries, the music is different; that version uses a broader set of older songs and classical pieces.

TL;DR: for the 2019 Catch-22 series , the beginning tune is “Basecamp at Dawn”.