1. Who invented the fugue (and the canon method)?
2. Schubert was inspired by Beethoven and found his own style. But Beethoven was the true groundbreaker
3. Some of his last works are really interesting but he is more a personal preference. I tend to prefer mentioning unknown composers that are still unknown to most people instead of the more wellknown names
4. There are other works as well but this is propably the only example on youtube.
5. Schoenberg did invent the 12-tone system and was the first truly serial composer or am I wrong?
6. Rite of Spring, Firebird etc. Really groundbreaking works. He did inspire many others like Bartok for instance.
7. I think he inspired many 20:th century composers.
8. Heard this from Shawn Lane (a wellknown fusionguitarvirtuoso) actually. It´s possible that Bartok just made some sketches that involved the Indian Konokol system. He propably didn´t publish anything significant that involved Indian rhythms.
9. I do believe that Metastasis was the first published work that involved massive clusters and glissandi.
10. True but his compositions for Organ are propably of higher quality then any composer before Bach. More complex the fugues in particular.
Dear Circles,
notice that what follows is my own view. I believe that are others (as yours), and by no means I want to prove you wrong. Let's just exchange ideas and see what comes from that.

1. I don't think we can figure out the inventor of the fugue, since it was a procedure that was developed simultaneously in many places and - in its most primordial instance - it was a popular procedure and the canon is an example of that. Furthermore, I would not talk about the proper fugal procedure until much later than Josquin times. It is actually a Baroque trend, with these many forerunners in Renaissance music. Notice that imitative counterpoint was widespread since late Ars Antiqua (more than two hundred years before Josquin).
2. The Schubert-Beethoven issue is a difficult one. Schubert was born in Vienna in 1797, that is, the city and the period were Beethoven was
the trend. I know no direct proves of influence, but I assume it as highlt probable. Nevertheless, Schubert developed his art in a direction much distinct from Beethoven, and in my modest opinion, is a far greater composer than the elder fellow. Two points, notwithstanding: a) the influence of Beethoven is beyond any discussion: no other composer influenced so many composers and generations than him; b) according to your reasoning, Haydn is the real groundbreaker, since Beethoven music would not exist without Haydn technique.
3. Well, this is personal. Period. I don't quite agree, but it is irrelevant: if you really believe Lawes is the guy, write an article and fight for publishing. Musicology is made of this kind of virtuosism. And, please, there is no sarcasm in this suggestion: I really mean it.
4. Thanks for the homework. I'm kind in a rush here, but as soon as possible I'll study this example.

5. I go with Richard here: invented is not quite the term. Furthermore, other composers were dealing at the same time with series and set theory as applied to composition. Roslavets is the most interesting example, imho. Then, if you consider twelve-tone technique a groundbreak, you must turn your attention to Webern, who was the single most important and influential composer and thinker of the system.
6. The Firebird is Parisian ballet music of the turn of the century. An outstanding example of that, but nothing really out of the ordinary. On the other hand,
Le Sacre was a vigorous turn, but again, a precise example of that very moment (other works that come to my mind are Schoenberg's
Pierrot Lunaire, Debussy's
Jeux, Bartok's
Bluebeard). Take a look at literature, painting, sculpture...this was the feeling of the moment.
7. I do agree with you: Debussy inspired many composers. But this don't change the fact that he was conservative composer. Notice this is not a problem: Bach was a conservative composer - one of the most conservative composers ever - and a highly influential one - perhaps THE most influential ever.
8. I'm sorry, but it does not count. I would never trust a guitarist as a source (because the classical guitar world is full of myths), and even if he is right, Bartok did not effectively used that. I can assume many other composers did know and listened eventually to Indian music, but what matters is what is public.
9. (A quick look at the Grove later

)
Metastaseis was premiered late on 1955. Clusters were used since the early days of the 20th century, and you find examples anywhere. The one that I always remember is a fascinating little piano piece:
Tiger, by Cowell, written in 1930 or so.
Glissandi are a very old procedure.
Clusters on glissandi...well, it was probably something Xenakis was the first to try, but I can't see the relevance in the course of music of this achievement.
10. Buxtehude is a major composer, no doubt about that. His sense of texture and the use of the organ are quite something, and I think more pianists should play his works for other keyboards.
Best regards,
Jay.