I got 12 out of 50, so 24%.
1,8,9,10,18,20,23,26,34,35,39,45
A bunch sounded familiar, and I was doing everything in my power not to check out the hints.
Edit: Ok, did the second one too, and am ashamed to say I only got 10% (11,22,29,32,50)...but I know 39 and it won't take my answers, and I know the tunes to both 47 & 48 but can't place the games.