From MakingStarWars.net:
Today, we received several reports about John Williams recording Star Wars cues at a Sony scoring stage. The Maestro is apparently recording the music for the new Star Wars: The Force Awakens teaser. As we’ve mentioned before, we heard the rough edit of the teaser was just a little over a minute long, showing off new characters from the film and culminating with the return of the Falcon to the big screen! We also heard that this rough edit was cut to existing Star Wars cues. The music recorded today was described by one source as a medley. Most likely what is being heard features new tiny transitions to make all the various cues line up to hit the beats the editors of the teaser envisioned. – Full report