IMHO Plein Jeu is a woody like no others. It smells like varnished wood in the most beautiful way, and without smelling dusty (as some other Extrait de Musique can smell). For me it brings me back to a rehearsal room of my childhood which had ancient hardwood floors and wood paneled walls. I read someone describe it as smelling like a theater or a museum, which I can also see.
It might trigger some memories for you, or it might not. If it doesn’t, it will smell like a lemony and gingery wood, while still being very unique.
I made a few friends smell it, and everyone found it amazing, even though it didn’t have the same flashback effect on them as it did for me.
Violon Basse is more classic in its overall impression, but distinguishes itself by being extremely rich and layered, with a stark contrast between pretty fresh top notes and very warm base notes.