Ok, it took more than a day or two, but here are the lyrics of Brave Topolini anyway:

Crowding the streets of Roma
Motor car chariots go by,
Brave Topolini, vroom, vroom, va-ra!
Brave Topolini, vroom, vroom, va-ra!
Trumpet-toned horns are sounding,
Bright as the sunrise of day,
Brave Topolini, vroom, vroom, va-ra!
Noisily going their way.

Making the tour of Roma,
Seeing the sights as they go,
Brave Topolini, vroom, vroom, va-ra!
Brave Topolini, vroom, vroom, va-ra!
Romaing the fabled city,
Faster than Caesar would dare,
Brave Topolini, vroom, vroom, va-ra!
Zip through the flower-filled square.

Opera nights in Roma,
Thrill to a new serenade,
Brave Topolini, vroom, vroom, va-ra!
Brave Topolini, vroom, vroom, va-ra!
Famous as Rigoletto,
Louder than Figaro song,
Brave Topolini, vroom, vroom, va-ra!
Thundering madly along.

When you depart from Roma,
Bearing this sound-souvenir,
Brave Topolini, vroom, vroom, va-ra!
Brave Topolini, vroom, vroom, va-ra!
Coins in the Trevi fountain,
Promise that you'll hear again,
Brave Topolini, vroom, vroom, va-ra!
Singing their welcome refrain.