Which asset type is always linked to a sound recording asset on YouTube?

A Composition Share asset is always linked to a Sound Recording asset on YouTube. This is because a sound recording is an interpretation of a musical composition. The Composition Share asset represents the underlying musical work (lyrics and melody), while the Sound Recording asset represents a specific performance or recording of that work. Therefore, every sound recording must be associated with the composition it embodies. Teaser or sampler assets and Other sound recordings are types of sound recordings themselves, not assets that are always linked to a sound recording. A Reference asset is used for Content ID matching and can be created from various asset types, but it's not an asset type that is always linked to a sound recording.