13.2, 5.1 and so on. "the best seat in the house"

I have found 5.1 can sound great for music, but only if the equipment is perfectly matched, and everything is perfectly set up and adjusted...otherwise it sounds terrible...whereas movies it's easy to get good sound, maybe hard to get great sound...but totally different

SACD 5.1 done right is great for music. Especially with orchestral, choral, live recordings. Best scenario with 5 floor standing speakers, 3 power amps, 3 preamps. All same. You can skip the sub, but not the cabling, requires accurate set up and the cost can get really high.

@petg60 

+1 on SACD, the roadblock is the recording. World of difference between a recording remastered for SACD vs one recorded for SACD. Smallish available catalog is another drawback along with cost.

There is a growing catalog of music mastered in atmos which is snowballing. Object based atmos mixes are backward compatible with 2, 5, or 7 channels if you don't have height speakers yet.You can even use headphones.
 

I guess you never saw Pink Floyd 50 years ago.

but nothing coming from the rear.

Well for a start that is entirely wrong. Unless of course you are out in an open field. There is always going to be sound reflected from the rear wall. You are just not aware of it. 

That is exactly what Dolby surround creates from a stereo (so sorry, stereophonic) source. (Yes that bracket is sarcasm!)

Music is far more critical than movies, so you'll need a superior system. Start with similar speakers that produce a similar sound and all channels critically balanced.

If there is any harshness from the speakers, it will be even more evident with additional speakers. Perhaps that is the reason millercarbon called home theatre sound crap (his word, not mine).

It takes a lot of effort, but when you get there it was worth it.