What is the technical term for the 'glide' (usually upwards) played by a harpist ~ as, here, 30-and-a-few seconds into the performance?

How many separate harp parts are going on within all this, in the original version?

The piece was originally the last section within a longer work: what kind of work?

At around 1'45" the tune is 'thrown around' more boldly between some more noble and assertive instruments: which are they?

Which is the correct order in which these instruments are significantly heard in the first minute of the piece?

During the long opening buildup of this piece, many of the instruments play not just 'straight' notes, but with a quivering texture according to their technique (jiggling their bows, fluttering their tongues or whatever). This helps create a sense of excitement and tension, perhaps even of the sight of the Firebird rising amid flickering flame. What is the technical musical term for such a manner of playing?

Appropriately, this music was used to accompany the lighting of the torch at a recent Olympiad ... in which year and city?

The underlying rhythm in the early stages of this piece is steady but very relaxed. How many beats are there to the bar?

What was the name of the Russian ballet boss who commissioned Stravinsky to write , which in turn was the composer's 'breakthrough' piece into the musical world of Paris and beyond?

Sometimes in music a pattern 'gets stuck' (like the repeated rhythm in Holst's ); sometimes one note or pitch clings on while the rest of the music rises or drops against it. In the Finale there is a lowish drone early on, but the last-but-one chord (just before the 3-minute mark) arrives while the trumpets have been hanging onto one note against all opposition. What is the technical term for such a musical device?