Polished vocal pop with that signature I've Sound production sheen. This 2009 box set celebrates ten years of the I've Sound collective, pulling together studio tracks and Budokan live recordings side by side. "L'Oiseau bleu" opens clean and bright, then you get the live version of "Kaze to Kimi wo Daite" which has that raw concert energy layered over tight arrangement work.
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"Paranoia" and "snIpe" bring the harder electronic edge the group is known for, with instrumental versions letting you hear just how dense those production layers are. "end of refrain ~Chiisana Hajimari~" is the kind of closer that sticks.
Each track paired with its instrumental really shows the craft. If you grew up on mid-2000s visual novel openings and never traced them back to I've Sound, start here.