And to amend something above. The band of frequencies doesn’t narrow per se as you increase the resonance, but the band of frequencies affected by increased resonance can be adjusted (narrowed or widened) in many filters. You’ll typically see this referred to as the Q factor of the resonated signal.
A lot of times when learning about synthesis it can be more useful to have a visual guide as to what’s happening to your signal. Instead of a song have a look at this video. The first 5 minutes goes over what I’d gone over in my first post, and he goes on a bit about a few other things after that. Give it a look.
https://youtu.be/2_Yba9S2moA?si=quwPy5ckYBGr-xFu