Panoplie translates to "array" or "collection", but it often implies a diverse and extensive range of something. It's a less common word than simply saying "beaucoup" (a lot) or "collection", making it more interesting and memorable.
In the song, the lyric "Des souvenirs, moi, j'en ai une panoplie" means "Memories, I have a whole collection of them." It suggests a rich and varied assortment of experiences, adding a touch of sophistication to the expression of having many memories from dancing on the dance floor.
Eva's "Sur La Piste" throws us right into the heart of a wild night out, where the dance floor becomes a stage for every emotion. She's been dancing, crying, and even