Songster is often used to describe singers in a performance or entertainment context.

Performance Context

A songster doesn't just sing; they often create music or add a personal flair to their singing.

Creativity Implied

Songster can sound old-fashioned or poetic; modern English often just uses 'singer'.

A songster, when referring to birds, highlights their musical, pleasant-sounding calls.

The term 'songster' for birds is more common in poems or literary works than in casual conversation.

Songsters, or songbirds, are often associated with springtime, as they're more vocal then.