 
 <prompt> Wetin Bach go use if e no be equal temperament? Based on di last question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: The theories wey dey surround equal temperament begin dey put into wider practice, especially as e enable wider range of chromatic possibilities for hard-to-tune keyboard instruments. Even though Bach no use equal temperament like how modern piano dey generally tuned, changes for the temperaments from the meantone system wey dey common that time, to different temperaments wey make modulation between all keys musically acceptable, make am possible for Bach's Well-Tempered Clavier. 