Help me explain what a free bass accordion is. What is an echo accordion?

The biggest feature of the free bass accordion is that the left hand has three and a half octaves, that is, the left hand has high and low bass, which is mainly suitable for playing polyphonic works in Baroque period. Echo piano mainly refers to an accordion with four rows of springs, which is usually used to play the piano.

The tone color and internal structure of echo accordion are different from those of traditional accordion. The timbre of echo accordion is very different from that of traditional accordion, which is more delicate, soft and loud, while the timbre of traditional accordion is rough. Moreover, the sound box of the echo accordion is relatively empty, so the timbre is changed.

Extended data:

The accordion has made great revolutionary progress in manufacturing technology, playing skills and professional music creation. Modern accordion can not only be used as accompaniment, solo, ensemble and concerto, but also can play the original works of large-scale music by classical musicians alone.

With the continuous improvement of accordion level and the rapid development of performance skills, professional accordion music creation has attracted the attention of many composers, and more and more works have been created specifically for accordion. In short, in more than one hundred years, the accordion has developed from the initial embryonic form to such a perfect and exquisite instrument, and the development speed is quite amazing, which is also rare in the history of musical instrument development.