I believe you’re asking for a piece of music — likely a pieza (piece) — related to the phrase "calle 1 de Madrid" (which literally means "1st Street of Madrid").
Cafes & restaurants line the arches of this stately square with Philip III's statue in the center. Royal Palace of Madrid calle 1 de madrid
But that is not the case. The building facing the famous "Bear and the Strawberry Tree" statue (El Oso y el Madroño) actually has the address Puerta del Sol, 1. This building houses a famous restaurant and shops. However, "Puerta del Sol" is a square (plaza), not a calle (street). So while you can stand at the geographic heart of Spain, you are not technically standing on the "First Street." I believe you’re asking for a piece of
“It doesn’t exist,” they said. “You’re chasing a ghost.” The building facing the famous "Bear and the
She showed him the paper. “I’m looking for Calle 1 de Madrid.”