On my HD system, I have my HD1@32kbps, HD2@32kbps, HD3@32kbps and HD4@24kbps all stereo and all playing music and the quality of my HD4 far surpasses the quality of the higher bit rate Satellite Radio Channels like 60's on 6 or The Bridge on chnl 32
And when using a Optimod or other hi-end processor for your FM/HD1, 32kbps sounds just like analog FM, without the multipath
On my other HD system I am doing HD1@48kbps, HD2@24kbps, HD3@24kbps and HD4@24kbps again all in stereo and all playing music and still sounds better than XM