Bleach began as a manga by Tite Kubo in 2001 and became a long running anime from 2004, with music by composer Shiro Sagisu known for blending orchestral, rock and quiet piano passages. Those softer piano cues became closely linked with the series emotional side, separate from its sword fights and battles. Clips of the piano style later spread through YouTube edits, anime forums and soundboards, where fans isolated the calmer moments for reuse. It remains popular because listeners recognise the mood instantly, even without knowing a specific episode or track name.