Orchestra Ringtone

I attended the Orchestra at Temple Square's "Classical Music Bouquet" concert. Near the end of the last movement of the last piece (Symphony no. 5, Dmitry Shostakovich), as the violin-dominated orchestra held a long note, a cell phone started to ring. But I almost couldn't tell because the ring tone was in exactly the same key as the Symphony. It started on the same note. As the orchestra finished its long note and started to move, it blended nicely with the finishing phone. When will that ever happen again?