The Beau Hunks

The Beau Hunks are a Dutch revivalist music ensemble who have performed and recorded the vintage works of composers Leroy Shield, Raymond Scott, Edward McDowell, Ferde Grofé, and others. They have been referred to as a "documentary orchestra," because they perform note-perfect renditions of music which is obscure and often commercially unavailable. For some projects for which no sheet music was known to exist, they had to reconstruct charts from original recordings extracted from films.

source: Wikipedia