I'm new to this category. I downloaded Bizhawk emulator and SMB Rom, but when I run it, the music was faster than it should be. Also the game runs in 50 FPS, shouldn't it be running in 59.97 FPS? Can someone help me configure my emulator, because I'm not sure if I did it properly.

You must be using a PAL (Europe) ROM, just get access to a Japan or USA ROM (NTSC),and it will run normally.

It worked, thanks a lot!