I see the question you are asking.
It depends on the source of the music, tbh. If the artist or their colleagues are the ones who put it on youtube - it is not stealing to convert to mp3 unless they specifically say not to convert it (this is just my opinion).
As for secular music, believe it or not almost ALL of their music is stolen concepts/beats/lyrics anyways. Very little is genuinely created by them. The people who make it big in the secular industry are chosen by rich people to make it based on everything BUT their abilities.
However, if the artist is worth supporting (Bizzle - Well Wishes comes to mind - all profits are going to a project to build wells in an African country with no clean water.), I would still buy the album.