Hearing Chihaya's version of "relations" right after Haruka's is like watching the same scene played by two completely different actors. MASTER BOX I & II ENCORE bridges the arcade and Xbox 360 eras by collecting every idol's take on the full original songlist plus the 360 additions like "GO MY WAY!!"
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and "Watashi wa Idol." The sheer volume here is staggering. "Massugu" sung by Haruka has this earnest warmth that Chihaya's version turns into something more intense and technically precise. "Omoide wo Arigatou" hits different depending on whose voice you're hearing it through.
Even the karaoke cuts are worth a listen for the arrangements alone. If you want to understand why fans get so attached to individual idols, listen to the same song sung six different ways and you'll get it immediately.