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Earth Lab Studio is a great company with a vision “to see the integration of natural materials back into the main stream of industry and society. Where companies and individuals choose ecologically sensitive renewable materials to create products through all facets of their lives, to serve our common needs”.
Its worth checking out some of their ideas. I especially like their experimentation with materials like rammed coffee grounds which is mixed with clay and gravels. 
plus a rammed earth candle holder. 
Rammed earth has great sound absorbing properties and attenuation (up to STC 57) which inhibits noise transfer between rooms extremely effectively. CSIRO tests indicate a sound transmission rating of over 50 decibels for a rammed earth wall of 250mm. It also helps stop sound reverberation, which makes it great for musical uses and is why it was chosen by acoustic engineers in a multi-million dollar, 150 seat concert hall in South Australia. It is to be constructed by Jurlique founder at Mount Barker. Read more about this project at this link.
Other examples the use of rammed earth specifically for the acoustic properties are the Wales Institute for sustainable Education WISE theater below
and the Martin Rauch designed Cinema Sil Plaz in Switzerland.
Earth Dwellings 