I am right there with you as far as Rock goes. Rush is one of my favorite bands, and I am a huge Steve Vai fan also. I pretty much listen to Rock, Hard Rock, Some really hard Rock, a bit of Yacht Rock, Blues Rock and you guessed it, a touch of Reggae.
So here is the thing with Rock. There are a lot of bad recordings, and even worse digital remasters out there. Most of us love guitars and dynamics (therefore many of us have owned Klipsch, lord knows I have owned a few pairs from KG4's in the 80's through Palladiums in 2012/13.).
There IS a reason for that. People who like Rock typically like forward midrange, a BIG sound, and some level of impact. Klipsch does that, and at lower volumes actually does it pretty well. I am not saying they are the be-all, end all, but they do do some things well (as do most horn speakers). With vinyl recordings, a tube amp, and some big klipsch, you can have some fun (to this day).
That said, when they get turned up (as most rockers like to do) they get bright, they get forward, and they get fatiguing. Then they get sold. (though they can be worth keeping around for a home theater).
I went through this. My first speakers after my Palladiums were SoundScape 8's. I dug them, I compared them to BRM's Exotica's and for Rock preferred them. The SS8's are dynamic, very accurate, and they play low. They do exactly what Jim designed them to do. I liked them a lot. I did find though they revealed everything in recordings and gave you what your source (for me a pre-pro and Sony HAP Z1-ES) music server were feeding them. This can be good, this can be bad.
They don't have an artificial mid-bass bump, that a lot of people who listen to rock like. I heard things in recordings (particularly Pink Floyd that was really deep) that I never heard before. But I also missed some of that "thump" you get in the mid-bass. With guitars, they excelled but again I will tell you that the accuton mid-range and RAAL are not forgiving (they are not overly bright, but they are revealing). When turned up at times they could get fatiguing. It wasn't the speaker - it was the recording.
I likely would not have sold mine if not for a budget crunch, I ended up with some Old NHT 3.3's for a while which had an even more robust low-end, lacked a smidge in the midrange compared to the SS8's and could also get a little bright on top. When budgets came back around, but not to SS8 levels, I ended up with some JBL S3900's I picked up used that I am currently using and like a lot. Though, they are not the speaker that the SS8's were by any means. Horns, but not remotely bright, very different than Klipsch.
I've talked to Jim a few times about building a "rock" speaker. He has mentioned a midrange (I want to say a Seas Excel Nextel?) that would be a bit more forgiving of bright recordings, and possibly using the Be tweeter up top. With a little tweak to the crossover/passives for a bit of mid bass oomph. I suspect eventually I'll get around to it as Jim's builds are second to none and I want to get a new Salk set-up here eventually.
All of that said, if in your budget Jim is suggesting the Song 3, then I would go with the Song 3. Particularly if you want something a little more forgiving for Rock recordings.