Is there a way to search and then download from youtube, with the stipulation that I only need to download the audio only, not the video.
An alternative to
This program needs the presence of
You can read more about mps-youtube here.
Then download and convert the YouTube video
Further audio options:
No. Youtube will never serve you just the audio stream.
They will give you everything, and then you can demux the audio out of it, there are tools for both.