If you enjoy hearing a full orchestra perform classical music, this is the film for you. The film will probably lag for most other people.
This documentary is structured into three parts. The viewer is introduced to several members of the Philadelphia Orchestra and lets them talk about how they define music, and what they love about it. Many of their stories are engaging and interesting. Seeing their passion for both classical and other genres can hold one's attention for at least half the film (but mentioning any of the neat tidbits would spoil it for those who haven't yet seen it).
The real highlights are all musical. There is no 'soundtrack' except performances recorded with the filming. The director wisely allows those pieces to continue as the visuals cut to interviews and such, but there is zero use of prerecorded music. Additionally, the camera work favors the musicians fingers over their faces when they play, allowing other musicians to better appreciate their technique.
Sadly, this viewer found that -- though the first half was very interesting -- by about halfway through the film none of the dialog was memorable. Perhaps if the beginning wasn't as strong, the ending interviews wouldn't seem to peter out. Still, the music was solid through and through.