DSP team wrote:
>>Given a collection of audio files (raw streams) I would like to
>>determine which of the songs has an acoustic guitar in it.
>
>
> This is an extremely difficult if not impossible task.
> Perhaps build a neural network and "teach" it what acoustic guitar is?!
>
>

How big a universe do you really have?
Are you trying to distinguish between a vocalist
with/without accompaniment?
with guitar versus vocalist with wind instrument?
with guitar versus bowed string instrument?
with guitar versus percussive string instrument?

Never try to solve the general problem.
Solve a *SPECIFIC* problem first.