Karlheinz Brandenburg used a CD recording of Suzanne Vega's song "Tom's Diner" to assess and refine the MP3 compression algorithm. This song was chosen because of its nearly monophonic nature and wide spectral content, making it easier to hear imperfections in the compression format during playbacks. Some refer to Suzanne Vega as "The mother of MP3". This particular track has an interesting property in that the two channels are almost, but not completely, the same, leading to a case where Binaural Masking Level Depression causes spatial unmasking of noise artifacts unless the encoder properly recognizes the situation and applies corrections similar to those detailed in the MPEG-2 AAC psychoacoustic model. Some more critical audio excerpts (glockenspiel, triangle, accordion, etc.) were taken from the EBU V3/SQAM reference compact disc and have been used by professional sound engineers to assess the subjective quality of the MPEG Audio formats.
What did Brandenburg use the recording to refine?
the MP3 compression algorithm

Both finalists found success after the show, but Aiken out-performed Studdard's coronation song "Flying Without Wings" with his single release from the show "This Is the Night", as well as in their subsequent album releases. The fourth-place finisher Josh Gracin also enjoyed some success as a country singer.
Who finished fourth on season two?
Josh Gracin

English Freemasonry spread to France in the 1720s, first as lodges of expatriates and exiled Jacobites, and then as distinctively French lodges which still follow the ritual of the Moderns. From France and England, Freemasonry spread to most of Continental Europe during the course of the 18th century. The Grande Loge de France formed under the Grand Mastership of the Duke of Clermont, who exercised only nominal authority. His successor, the Duke of Orleans, reconstituted the central body as the Grand Orient de France in 1773. Briefly eclipsed during the French Revolution, French Freemasonry continued to grow in the next century.
Who was the successor to the Grand Mastership of The Duke of Clermont?
the Duke of Orleans