It is arranged in the key of the original song, A♭. The same goes for performances and karaoke, which are sold separately by each company. The length of the song is also the same as the original.
Solo & Back Tracks:
https://music.youtube.com/playlist?list=OLAK5uy_llmTJDNVzDu7yAWLMTNqTzabFi7p26Lf8