Vita speakers doing heavy lifting on this one and honestly it sounds great. SAO Hollow Fragment's soundtrack nails that early-to-mid 2010s anime RPG tone with clean synth orchestration that fits the portable format. "街角のワルツ" (Street Corner Waltz) is this gentle town theme that makes you want to just idle in the hub, and Philia's two themes tell a whole emotional arc by themselves, the sorrow version all minor key piano and the smile version lifting into something brighter.
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"蒼暗の月" has this moody atmosphere with layered strings that sets up the Hollow Area sections perfectly. Battle themes escalate nicely from 4 through 7 too. If you sunk 100 hours into this on Vita, the soundtrack will take you right back.