The "Bros" in FLACBros represents a community of audiophiles who reject the standard lossy compression of MP3s. Instead, they advocate for the Free Lossless Audio Codec (FLAC) , an open-source format that compresses audio without discarding any data.
A critical part of the "pro" audio experience is ensuring your files are true lossless rips rather than "upscaled" MP3s: flacbros