I just want to build a little python music client on my raspberry pi. I installed "mpg321" and it works great but now my problem. After sending the command

```
os.system("mpg321 -R testPlayer")

```

python waits for user input like play, pause or quit. If I write this in my terminal the player pause the music oder quits. Perfect but I want python to do that so I send the command

```
os.system("LOAD test.mp3")

```

where LOAD is the command for loading this mp3. But nothing happens. When I quit the player via terminal I get the error:

```
sh: 1: LOAD: not found

```

I think this means that 

```
os.system("mpg321 -R testPlayer")

```

takes the whole process and after I quit it python tries to execute the comman LOAD. So how do I get these things work together?

My code:

```
import os

class PyMusic:
    def __init__(self):
        print "initial stuff later"

    def playFile(self, fileName, directory = ""):
        os.system("mpg321 -R testPlayer")
        os.system("LOAD test.mp3")

if __name__ == "__main__":
    pymusic = PyMusic()
    pymusic.playFile("test.mp3")

```

Thanks for your help!