Has your HiFi changed your musical tastes

Yes.
The better my equipment got the better the recordings I was looking for to justify my systems ability.
By doing so, I've matured in my musical palate.
I still listen to Rock, but I'm more selective in the recording quality of the music.
Started out with smooth jazz and then started trying more improvisational jazz. I've also got some classical and blues. I little bit of everything.
Had my system not been as revealing as it is, I may not have tryed all the other genre's and would have missed out on some beautiful music.

I listen to all kinds of music just to hear how it sounds.

Like Mapman, I listen to anything now, as long as the recording is in excellent condition, just to here how it sounds.

In general no. But, I do listen to something different once in a while that they did a great job recording it, capturing it the way I'd like to see my preferred music recorded. Some jazz will sound good on a mid-fi system because of the way they captured it. I'm guessing less mikes and gear needed/used in comparison to classical is part of the reason. Some of the older rock music sounds like they had the mikes mounted right up against the instruments, with the VU meters banging at the top of the red scale.

Yes I became more interested in classical music. I attribute this to two things the time I would devote to listening and a more resolving system.