On the contrary, I would say that it is! You can't just put a man in the ground with no marker, unless there's a plague or something. In fact, since most cemeteries require a stone of some sort, you'd LITERALLY be burying the dead if you provided this. Because if it couldn't be provided, the person would have to be cremated.
I'd say that's about as "bury the dead" as it gets.
Anything related to the funeral/burial and associated gathering; anything pertaining to the burial of a Catholic would go under the heading "Bury the dead".
Just like you can violate the 5th commandment without killing, and the 6th commandment without literally committing adultery -- you can "bury the dead" without literally picking up a shovel.
What RomanCatholic1953 is referring to is the SPIRITUAL work of mercy, "Pray for the living and the dead".
Which is the more important? Does it matter? We're supposed to be racking up merit under BOTH main headings (Corporal and Spiritual works)
Singing chant at a funeral would actually be both. You're helping at a funeral, plus you're singing chant (="praying twice").
The Novus Ordo tends to over-emphasize the corporal works of mercy at the expense of the spiritual works of mercy. But that having been said, NEITHER should be forgotten! They are both part of a well-rounded Catholic life.