Blue Sky Studios Is The Animation Subindustry Of 20th Century Fox.
The Logo As Seen Here.
1997[]
The version in 1997 has only 4 tunes on 90s rock gutiar and a whoosh
1999[]
The "BLUE SKY" logo fades and zooms in and has a 1984-1987 Group W tune. On the last three notes, the copyright stamp fades in.
Short variant: The logo zooms in as the last 3 notes play. the copyright stamp and the logo both fade in.