Audio streaming uses A2DP profile which is not implemented in the TCU or ULF we have in our BMWs. You should be able to find an app for Android or Windows (not sure for iPhone) that might let you stream through the HFP or HSP (hands-free/headset) profile but the quality would be bad.

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4.8is 2004 imola red
4.8is 2005 Black on Black - DINAN/2 sold
4.4 2004 X5
2003 330xi
2008 328xi - sold
4.4 2000 X5 - sold