I haven't played with audio files, but in general, the Google Drive
Android API (GDAA) does not deal with audio files per say. You just create
a file, set metadata and stuff binary content in it. Look at the code here (plus some readme
blah blah here). You'll find a code line
byte buff = ("written on: " + _dfn.getName()).getBytes();
if (null == _gc.creatFile(fldr, name, MIMETEXT, buff)) return;
there, that produces byte buffer and creates a file with text
MIME type. So, try to use it, just replace the MIME type and stuff the
'buff' with your audio stream. I do it successfully with JPEG binaries.
There is also GooApiClnt wrapper class there that handles most
of the basic GDAA functions. Don't try to code this way at work,
though, it may get you fired :-).