No Sound with SDL_mixer - c++

Question

I read and tried all the other posts to that topic, but nothing helped. When I try to play music with Mix_PlayChannel() I don't get an error nor do I hear some sound! I tried for hours now and nothing helps. The program just finishes happily. But no sound! I am using Ubuntu 12.04 64bit.
Thanks!
[EDIT]
Here is the code I use:
#include <iostream>
#include <SDL/SDL.h>
#include <SDL/SDL_mixer.h>
int main(int argc, char** argv) {
Mix_Music *music = NULL;
Mix_Chunk *wave = NULL;
SDL_Init(SDL_INIT_AUDIO);
int audio_rate = 44100;
Uint16 audio_format = AUDIO_S16; /* 16-bit stereo */
int audio_channels = 1;
int audio_buffers = 4096;
if(Mix_OpenAudio(audio_rate, audio_format, audio_channels, audio_buffers) < 0) {
printf("Unable to open audio!\n");
exit(1);
}
if(Mix_Init(MIX_INIT_MOD) != MIX_INIT_MOD)
std::cout << "errer";
Mix_Volume(-1, MIX_MAX_VOLUME);
music = Mix_LoadMUS("1.wav");
wave = Mix_LoadWAV("1.wav");
if (music == NULL) {
std::cout << "Could not load 1.wav\n";
std::cout << Mix_GetError();
}
if (wave == NULL) {
std::cout << "Could not load 1.wav\n";
std::cout << Mix_GetError();
}
Mix_VolumeChunk(wave, MIX_MAX_VOLUME);
Mix_VolumeMusic(MIX_MAX_VOLUME);
Mix_PlayMusic(music, 0);
std::cout << Mix_GetError();
Mix_FadeInChannelTimed(-1, wave, 0, 100,1);
std::cout << Mix_GetError();
return 1;
}
I try both PlayMusic() and Mix_FadeInChannelTimed(). Both files are loaded correctly but not played. Sound is not muted, wav-file is playable with aplay or other tools. I check with alsamixer that all channels are open and not too low.

Answer 1

I now found out that the program needs to run until the sound has finished playing! I added a usleep() command after the play command and it plays nicely. So that was really mentioned nowhere that PlayMusic() does not keep running.