Thanks, Randy. These are all good observations. A few of these have been guessed already, however:
#1 is Danish trumpeter Hugh Steinmetz leading a sextet through the tune "Nisshimbo," from his first album as a leader for Debut (Denmark), Nu!, recorded in 1966. The reedists are Karsten Vogel and Niels Harrit.
#4 is our own Allen Lowe on tenor from his first LP as a leader, For Poor B.B. and Others, recorded in 1985 and released on his Fairhaven imprint. The tune is called "H.W." and features Bob Neloms on piano.
#6 is a Japanese group called Evolution Ensemble Unity, featuring saxophonist Mototeru Takagi, trumpeter Toshinori Kondo and bassist Morio Yoshida. It was recorded in 1976 and released via their own private label on an album called Concrete Voices. It's a cover of the Steve Lacy tune called "Bone."
#10 is a tune called "Cogito Ergo Slum" from the UK-based collective Balance, with Ian Brighton on guitar, Radu Malfatti on trombone, Phil Wachsmann on violin, Colin Wood on cello and Frank Perry on percussion. This was recorded in 1973 and released on the Incus label.
I'll throw this bone out there if it's not been figured out already, in that the Allen Lowe cut is the only one from an American ensemble though #7 does feature one American player and it's not the cellist. Track #2 is indeed led by a doubler, who plays alto in addition to clarinet. Each track represents creative music from a different country.