This iTunes release is called Digital Colors, created by someone named yasuo:
If you can't afford it, the good news is that all of the songs here can be found on
First track- I prefer the translation found in that link I found since the name sounds more Touhou-ish compared to what they put in the iTunes store, as this track sounds like one anyway. The song gets bad further down because it becomes a jumbled mess of tones at that point (like how ZUN tends to do it anyway, so I can't fault the composer for keeping true to the style). In short, it sucks.
Second track- Hey, this sounds familiar... oh yeah, it was part of the Free Play list in Project Diva. Silly me. Also sounds Touhou-ish, but at least it remains focused unlike the previous track. That's probably why Sega picked it.
Third Track- Sounds like the opening song to an RPG that has lots of Blue Skies. I like blue skies.
Final Track- A nice slow-sounding track. It's like, good enough to negate the first track altogether.
Judgement: yasuo should stop emulating ZUN. Also as mentioned in the header of this post, it's kinda pricey, so you really need to either be a Vocaloid fan or have a lot of disposable income to buy it.