Why is my SDL_mixer playing my wav. file too fast?

From this Lazy Foo tutorial (https://lazyfoo.net/tutorials/SDL/21_sound_effects_and_music/index.php) I wrote the following lines of code:

#include <SDL.h>
#include <SDL_mixer.h>

bool running = true;
int main(int argc, char** argv) {
    SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO);
    SDL_Window* window = SDL_CreateWindow("testing musique", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, 0);
    SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
    SDL_Event quit;
    Mix_Music* music;

    while (running) {
        while(SDL_PollEvent(&quit)){
            switch(quit.type) {
            case SDL_QUIT:
                running = false;
                break;
            }
        }

        Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, 2, 2048);
        music = Mix_LoadMUS("../pikachu/keypress_BMP/beat.wav");
        Mix_PlayMusic(music, -1);

        SDL_SetRenderDrawColor(renderer, 20, 20, 255, 255);
        SDL_RenderClear(renderer);
        SDL_RenderPresent(renderer);
    }

    Mix_FreeMusic(music);
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();
}

I even used the same audio file (beat.wav) as Lazy Foo did in his tutorial, but while his program runs without a hitch, mine plays the wav too fast (despite the fact that I checked every parameters to make sure mine matched with his). I tried decreasing the frequency parameter in Mix_OpenAudio, but while the wav did slow down, so did the pitch, and it should not have made sense to do this in the first place. What should I do?

Thank you.

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