Based on the clue 'back bending dance thats neither heaven nor hell', what is the answer?

What is associated with: bachs 1721 concerts a plusieurs instruments are popularly known as these concertos? Based on the clue 'back around 100 ad ptolemy studied the refraction ...', what is the answer? Based on the clue 'back at the ranch you might know this adverb denot...', what is the answer? Based on the clue 'back bacon is also known by this geographic name', what is the answer? What is associated with: back in 1499 this country had a military force so powerful it forced germany to sign the treat… What is associated with: back in 1860 it was the uniform you had to wear to be on garibaldis team? What is associated with: back in 1898 william morris went into business as one of these? What is associated with: back in 1903 rip van winkle turned up as a song in a musical based on this fairy tale?