No, in fact I'm trying to get a more modern sound in the harmonies while still not having it be too dissonant as the most dissonant movement comes after it. When the Bass Clarinet and English Horn along with other instruments come in in later movements, it will be more obvious that I'm working with a modern orchestra rather than a classical orchestra.
Yes. Holst was the main inspiration for this piece and some movements like Mercury, Jupiter, and Saturn have similarities to the same movements in Holst, and others like Venus and Mars are opposite that of Holst in my suite. For Mercury, the similarities to Holst are:
6/8 time signature
Smaller orchestra
Sharps/Flats key contrast -> though this is also different in terms of scale, Instrumental in Holst, non-repeating Binary Form in my suite
Hemiolas and other complex rhythms
Fast tempo
Some harmonic dissonance, but not a lot compared to one of the other movements.
As for the opposites, you know how Holst's Mars is basically a 5/4 march through hell with all that dissonance, even atonality and Holst's Venus is relatively bare in comparison, peaceful, almost melancholic, and more consonant? In my suite, those are reversed, so Venus is the dissonant march through hell and Mars is the instrumentally barren and more consonant of the 2 movements.
Those similarities and opposites come from one thing, Holst going with the Astrology/Mythology interpretation and me going with the Astronomy interpretation. Sometimes they align quite a bit, like with Mercury and sometimes they don't align at all like with Venus and Mars.
And I'm also including Earth and Pluto in my suite, which Holst never bothered to do.