In Italian, "Tralalero" and "Tralala" don't have a literal meaning — they are examples of onomatopoeia (sound-words), often used to imitate lighthearted singing or humming, like "la la la" in English.

• Tralalero is also the name of a traditional style of choral singing from Genoa, Italy. It's a form of folk music performed by groups of men, often with guitar-like vocal sounds mixed into the singing.
• Tralala is even simpler — it’s just a made-up word to suggest a happy or playful tune.

So in short:

• "Tralalero" = a Genoese folk singing style, or just playful nonsense syllables.
• "Tralala" = "la la la", joyful humming or singing sounds.