Is there An Online Platform Providing PDF Copies of Various Kinds Of?

Is there an online platform providing PDF copies of various kinds of reliable music sheets for piano classical songs and all other types of music?

I'm a full time, professional classical musician and have studied, listened to, performed and loved it my whole life. For many years, I listened to mostly classical music at home. These days, it's primarily classic pop. I don't care for attempts to rank one over the other. Every genre of music has its place if it speaks to you personally. I would rather hear pop music written and performed by musical geniuses than classical music of a third-rate composer. A great pop songs sets out to do things in the course of just a few minutes that classical music can't do, and vice versa. In particular, the singing styles are so different. Why should I have to choose between Fischer-Diskau singing Schubert and Billie Holiday or Sarah Vaughn or Aretha Franklin? T really are not comparable; all are brilliant. I would not care to hear a classical singer attempt pop music, nor vice versa. What I will say is that classical tends to be a deeper, more sustained experience that requires ATTENTION. A great pop song is an intense burst of joy or sorrow that hits you in the gut for a few minutes and is gone. Variety is the spice of life. I don't have to choose one over the other. After a day of classical music, it's very nice to relax with something completely different. And writing a truly great pop song is virtually a miracle! The same few chords that have already been used a million times, and people still manage to be creative with it.