Mendips and 20 Forthlin Road are modest addresses carrying an extraordinary amount of musical memory. The National Trust preserves the childhood homes associated with John Lennon and Paul McCartney, where early composing and rehearsing formed part of the Beatles' story.

A home changes the scale of that history. Before a song belongs to a stadium, a catalogue, or a generation, it may belong to people trying ideas in a room that also has other purposes. Music-making sits beside household life rather than outside it.

The Cavern offers another part of the Liverpool picture: the development of a live act through repeated performance. Home and stage do different work. One permits experiments within a familiar space; the other brings the response of an audience into the process.

Listen to an early song with both scales in mind. Hear the vocal relationship, the economy of the arrangement, and the way a short section creates contrast. Familiarity can make these decisions seem inevitable when they were once choices.

A visit to a childhood home cannot reconstruct every private moment, and it should not promise to. Its value is more grounded. It places the beginnings of celebrated work in rooms of human size, reminding a listener that songs are made before they become monuments.