One complaint I often get is that once my app starts music and other background apps making sounds stop playing.
Go to your app in XCode and find the file Classes\Application\CSoundPlayer.m and the method initWithApp. Once there change the following from ...
UInt32 sessionCategory=kAudioSessionCategory_SoloAmbientS ound;
AudioSessionSetProperty(kAudioSessionCategory_Solo AmbientSound, sizeof(sessionCategory), &sessionCategory);
To:
UInt32 sessionCategory=kAudioSessionCategory_AmbientSound ;
AudioSessionSetProperty(kAudioSessionProperty_Audi oCategory, sizeof(sessionCategory), &sessionCategory);
Now gamers can listen to Spotify and play the latest MMF2 creation.