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