Though you won't spend hours micromanaging your soldier's stats, troop management is still fairly in-depth and requires a bit of strategy. Again, all of your troops can only be summoned a limited number of times. Though there are a few extremely rare exceptions (again, it's all in the song), you can only summon powerful troops 2 - 3 times. So, even though that Metallica song you really like produced what looks like a dud, the ability to summon him might make him a good investment, especially if you play with him in battle a few times.
Characters earn crystals by participating in battle, which acts like experience points. After a battle, you can dump these points into soldiers, increasing their level - giving them a nice stat boost. With a few battles under their belts, weak soldiers can go toe-to-toe with your powerful troops. You can also take individual troops into special VR training games that will earn them a few extra crystals. Additionally, crystals and other attack boosts are earned just by listening to songs on your iPod.
Besides the text size, my other concern going into Song Summoner was using the iPod wheel as a control method. It was fairly obvious that some sort of Radial Menu would be used, and it is, but the wheel's sensitivity made me wonder just how easy it would be to use it. For the most part, my pre-conceptions were pretty much what I got from the game. The Radial Menu is easy to understand, but the wheel is a little too slick so it is easy to shoot past an option. Still, it is playable and eventually you'll learn the right amount of thumb-muscle control to make selections.
Overall, Song Summoner makes a genre notorius for not being approachable, one that anyone can get into. Players who logged 200+ hours into Disgaea or Final Fantasy Tactics may not like the stripped-down gameplay, but the ability to create troops from songs should give you something every bit as obsessive as trying to tweak stats. Still, the gameplay is very straightforward and easy to pick-up, making it a good buy if you have $5 and are sick of playing Vortex or Solitaire.