You can use Play it slowly, which is rather bare-bones, or Sonic Visualizer, which is something of the opposite, but quite powerful.

My daily workhorse is Transcribe!, which I’ve been using for nearly 30 years, actually. Very powerful, and very intuitive, and with a lot of useful effects, such as filtering out the vocals (if possible), etc. I paid a one-time fee for a subscription back in the day. Money well spent.

I wrote this eulogy to St Stallman already quite a few years ago, with the point that he may be wrong, but he is wrong in the right way, and that is a good thing. Still relevant:

St Stallman: A Hero of the Highest Order