Just for fun, I chatted up a few of my coworkers. 5 women, 3 in their 20's, one in her 30's, and one in her 50's. I know they've all seen several MCU movies; we've talked about them before. I didn't mention the Avengers, just asked them to hum iconic movie theme songs.
They covered most of the big ones. Star Wars right off the top, though they started with the Imperial March (we used to play it when our former boss came into meetings) before getting the main theme. Jaws next, then James Bond and Mission Impossible (which caught me off guard by sidetracking into playing Goldeneye in college from the young ones), Harry Potter, and Rocky. Then they stalled, so I started prompting. Jurassic Park? Yes. Indiana Jones, surprisingly, no, until I started to whistle it, then they joined in. Superman, nope. One of them said Batman, but no one could hum it. Then Spider-Man, but they meant "Spider-Man, Spider-Man, does whatever a spider can". Heh. Then they started naming TV theme songs, so I figured we were done. I asked "what about the Avengers?".
Nope. Complete blanks. The only response to that was "I didn't know it had one". I tried to play it on my phone - from this thread - but the video came up "unavailable", so I missed the chance to see if they recognized it at least.