I have tried to be careful about not infringing copyright when offering selections to be played back.  A considerable amount of material is freely available on the Internet; for example recordings over 50 years old.  Also many offerings on YouTube have an "embed" option whereby you can make that YouTube video part of your own website.  In both cases I have used full length recordings.
In other cases, the music can only be legitimately downloaded for a fee.  The fee is generally very low, but in these cases I have restricted myself to short excerpts.  In a few cases, the recording is from my own collection and I have assumed that it's OK to use.

That is why the choice of full performances tends to favour old recordings and YouTube amateurs.