These transcriptions are available on the internet. Please keep in mind that the artists and their families may still receive income related to their works. If you end up listening to something a lot it may be a good thing to actually buy it if you haven’t already done so!
Here’s some articles from Jazz Advice:
- Overcoming Obstacles to Transcription
- How Transcribing One Solo Can Entirely Change Your Approach To Improvising
- Improving Musicianship Through Transcription