Please, check my translation.

1) The scene was rockin', all were digging the sound (translation: the scene was going on, all were enjoying the sound/music);

"The scene" was the party. It was "rockin" meaning everyone was having a good time. We were all enjoying the music is good.

2) Igor on chains backed by his baying hounds (translation: Igor chained were helped by his howling dogs); I don't know what "Igor on chains" means but it seems he was chained to something. The howling dogs "sang" along to accompany him.

3) The coffin-bangers were about to arrive with their vocal group, "The Crypt-Kicker Five" (translation:_the coffin-bangers (?)were almost arriving with their vocal group/band called 'The Five kickers of Crypt"); The coffin-bangers were goign to arrive soon with their band "The Crypt-Kicker Five." Don't change the name of a proper noun, like a band name.

4) Drac opened the lid and shook his fist and said "Whatever happened to my Transylvania twist ?" [(translation: Dracula opened the lid (of his coffin) and swang/rocked his fist and said (in this case asked): "What happened to my Transylvania bracelet ?"] "shook his fist" is a fixed expression. Don't try to change it. The "twist" is a dance, not a bracelet. Dracula opened the lid of his coffin and shook his fist, and asked why they weren't doing his dance, the Trannsylvania Twist.

The dogs "sang" background to his song. For baying, you can substitute howling, but not barking. And dogs don't yell or shout.

Have you heard a dog making that "Oohh-ooh-ooh" sound? It's quite different from the "arf, arf" sound.

I guess "crypt-kickers" are people who kick crypts. I don't know what coffin bangers are either.

Realize it's just a silly song. You're not supposed to think about any of it too literally!

Thank you, Calif Jim.

Best regards,

Adrian