"I Got A Name" by Jim Croce | Django Unchained
Quentin could not have picked a better song for this montage. At 0.15 Dr Schultz looks at young Django and realizes that he does look like a real-life-Siegfried and smiles to himself. The guitar work towards the end of this Jim Croce song is simply brilliant. This song reminds me of Micheal Jackson's Motown Years, specifically, a song called "Morning Glory".
Also take a look at the horse riding during this montage. The riding appears to be choreographed to be in sync with the song's rhythm. And what a brilliant scene towards the end when Kerry Washington looks at Jamie Foxx.