On Yandex.Disk, files named with "01" are usually the result of automated track numbering from ripped CDs or organized digital albums. If this is a shared link, it is often part of a larger folder containing an entire album where "Angel" is the first song.
A digital track often cataloged as "01 Angel" on streaming and storage platforms like Shazam . 01 Angel.m4a — Yandex.Disk
This is the prominent first track from the soundtrack of the anime film Perfect Blue . On Yandex
A rock track from California frequently listed as "01 - Angel" on ReverbNation . File Context on Yandex.Disk 01 Angel.m4a — Yandex.Disk
Song #1 from the Angel Voices Special Edition by Roger Jones, often used in choral or Christian music contexts.