Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Barrington Pro Alto Saxophone by LA Sax in Champagne Finish
Product description: The Barrington Pro Alto Saxophone is designed in cooperation with the famous L.A. Sax company. The Champagne Barrington Pro is the toast of the town! A beautiful copper like lacquer with a slightly darker sound but still with plenty of projection. Sound Playability Beauty Durability all for one great price.
Product feature: Beautifully engraved bell, bow and body, Full-ribbed construction, Exotic stone finger buttons enhances the sound and beauty of the horn, High F# key and French Style front F spatula, Deluxe light weight case with backpack straps
Product brand: Barrington
Target attributes: Instrument Range
Answer: attribute: instrument range
value: alto
source: product description
attribute: instrument range
value: alto
source: product title