can i stream Apple Music to a Bose Soundtouch?

I have done a little testing and can report that using a Mac and iOS you can stream iTunes/Apple Music content over BlueTooth. This method also allows streaming to multiple SoundTouch devices. Alternatively you can add an Airport Express to the aux port of any SoundTouch device and stream using AirPlay over WiFi. Multiple SoundTouch device play in this manner is not supported.

According to this, you can't. At least, now.

You are welcome!

Via the Bluetooth connection you can stream anything from an iOS device. From the Soundtouch itself (and the Bose app) you are limited to whatever Bose offers.