song and performance entities
At album-level, the soundtrack credits its first track's composer only to "Traditional". But at song-level, two composers are added.
From Los Lobos' version, I discovered that the song was "also performed by" Lalo Guerrero in collaboration with the band. When I click on their song collaboration though, it's instead linked to Los Lobos' own version. The album that released their collaborative version wasn't listed among the albums where the band's own version appears on (the same song page on which I discovered the song was also performed by Lalo Guerrero in collaboration with the band).
I'm confused.