The Mozart archivists are calling this composition Ganz kleine Nachtmusik which loosely translates to Very Little Night Music. A possibly fitting description of the musical overtones and undertones of this piece. The music has seven miniature movements for the string trio. 

This piece of Mozart music is thought to be a fairly rare example of Mozart’s early chamber music compositions, and many experts were under the assumption that these had been lost to history.

This one comes from a time in his life when he was on the younger side, probably in his teens, though representing that he, of course, already was composing well beyond his years.