Updated to add:

A bit more digging reveals that it's probably from an opera by Rimsky-Korsakov based on stories from Nikolai Gogol - "A May Night"
there's a section in there where Mermaids are reciting lines

...

KHOR RUSALOK
Davajte, devicy,
DAvajte, v vorona!

1-JA RUSALKA
Komu zh byt' voronom?

KHOR RUSALOK
Komu byt' voronom?
Byt' voronom tebe.

1-JA RUSALKA [nasedka]
Voron, voron, chto ty delaesh'?

2-JA RUSALKA [voron]
Jamku roju.

1-JA RUSALKA
Na chto roesh' jamku?

2-JA RUSALKA
Chtob den'gu najti.

1-JA RUSALKA
Na chto tebe den'gu?

2-JA RUSALKA
Iglu kupit'.

1-JA RUSALKA
Zachem iglu?

2-JA RUSALKA
Meshochek sshit'.

1-JA RUSALKA
Zachem meshochek?

2-JA RUSALKA
Chtob soli kupit'.

1-JA RUSALKA
Zachem tebe sol'?

2-JA RUSALKA
Chtob shchi posolit'.

1-JA RUSALKA
Zachem tebe shchi?
.. and so on

When I eventually persuaded Google translate to help out, it came out roughly as :

"1st MERMAID [Mother hen]
Raven, raven, what are you doing?

2nd Mermaid [raven]
I’m giving birth to Jamka./ I think this should be: I'm making a hole

1st Mermaid
What are you digging a djamka for? (hole)

2nd Mermaid
To find dengue. / To get a coin?money?

1st Mermaid
What is your day?

2nd Mermaid
Needle to buy.

1st Mermaid
Why a needle?

2nd Mermaid
Sew the bag.

1st Mermaid
Why a pouch?

2nd Mermaid
To buy salt.

1st Mermaid
Why do you need salt?

2nd Mermaid
What will salt.

1st Mermaid
Why do you need cabbage soup?

And so on... Not sure if it's from Gogol, or from tradition.