This is a gray area. The composition of “See You Again” is owned by Atlantic Records and the songwriters. However, fall under mechanical licenses.
Many independent artists (e.g., PianoPrinceOfAnime , Samuel Kim , Peter Roe ) have uploaded their epic orchestral covers to YouTube. This is a gray area
Full orchestral layers and choir elements often join to provide a sense of finality and eternal brotherhood. Notable Orchestral Covers This is a gray area