Often, "Free FLACs" are just low-quality MP3s converted into a FLAC container. You get a larger file size without any actual improvement in audio quality.
For fans of the series, the music of Kessoku Band isn't just "anime music"—it’s a masterclass in modern J-Rock production. From Ikumi Hasegawa’s powerhouse vocals to the intricate, math-rock-influenced guitar lines, there is a lot of detail packed into every track.
Buying the physical CD and ripping it yourself using a tool like Exact Audio Copy (EAC) is the most "Bocchi" way to own the music. This gives you a permanent FLAC library and a cool physical collectible.
The success of Bocchi the Rock! depends on album sales and streams. Downloading for free bypasses the very people who made the music possible. Where to Legally Get Kessoku Band in High-Res
For those outside of Japan, Qobuz offers the album in lossless FLAC formats for purchase and streaming.