I couldn't find any documentation about this. Can anyone help me?

if (SDL_Init(SDL_INIT_AUDIO) < 0) return -1;
        
if( Mix_OpenAudio( 48000, MIX_DEFAULT_FORMAT, 2, 4096 ) == -1 ) return -1; 
Mix_Chunk *wave = Mix_LoadWAV("a.wav");
auto *p = SDL_RWFromMem(wave->abuf, wave->alen);
if(!p || !wave) return -1;
Mix_Music *music = Mix_LoadMUSType_RW(p, MUS_WAV, 0);
if(!music) cout <<"load Mus error " << SDL_GetError() << endl;
Mix_PlayMusic(music, 2);
//Mix_PlayChannel(-1, wave, 1);
char c;
cin >> c;

Mix_FreeMusic(music);
Mix_FreeChunk(wave);
Mix_CloseAudio();

I want to manipulate some wave data and store it in Mix_Music format with SDL2_Mixer. Above code gives me "load Mus error unknown wave format" error.

commented Mix_PlayChannel function works fine.

How can I change this code to make Mix_PlayMusic function work?