DNA: a future preservation medium for audio?

Scientists from the European Bioinformatics Institute in UK and Agilent Technologies in USA have encoded digital files on synthesized DNA, including all of Shakespeare’s sonnets in ASCII text, a PDF of a scientific paper, a medium-resolution JPEG 2000 colour photo - and a 26-second MP3 audio excerpt from Martin Luther King’s 1963 I have a dream speech.

Source: Nature, 2013. "Towards practical, high-capacity, low-maintenance information storage in synthesized DNA" http://dx.doi.org/10.1038/nature11875

Further information:
MP3 files written as DNA with storage density of 2.2 petabytes/gram
 "The cost analysis done by the authors suggest that the technology may soon be suitable for decade-scale storage, provided current trends continue". At present it would only be economical for very long term storage of 500 years or over. ...while "it will only take a decade to get to where DNA-based storage would start making sense for archiving data for as little as 50 years."