At least with the Philadelphia Orchestra and Yannick Nezet-Seguin, who prefers editions called urtexts (with the composers’ original phrases, dynamics, and notes), says librarian Robert Grossman. “Although the Philadelphia owns more than 5,000 scores and their instrumental parts in the public domain and has another 5,000 scores for pieces written since 1926 whose parts must be rented, this means Grossman is starting with a clean slate when working with the urtext editions.”