symphonies n tchaikovsky wiki

 https://en.wikipedia.org/wiki/Symphonies_by_Pyotr_Ilyich_Tchaikovsky

The fruit of Liszt's labors was what he eventually termed symphonic poems. In them, he used two alternatives to sonata form. Beethoven had used the first of these, cyclic form, to link separate movements thematically with one another. Liszt took this process one step further by combining themes into a single-movement cyclic structure.[58] The second alternative, thematic transformation, originated with Haydn and Mozart.[59] This process worked in a similar manner as variation but instead of a theme being changed into a related or subsidiary version of the main one, it becomes transformed into a related but separate, independent theme

Keller offers the second theme in the first movement of the Fourth Symphony as an example of how this process works. In sonata form, he writes, the first subject enters in the tonic and the second subject follows in a contrasting but related key harmonically. Tension occurs when the music (and the listener with it) is pulled away from the tonic. Tchaikovsky "not only increases the contrasts between the themes on the one hand and the keys on the other," but ups the ante by introducing his second theme in a key unrelated to the first theme and delaying the transition to the expected key. In the first movement of the Fourth Symphony, Tchaikovsky introduces the second theme in A-flat minor. Since the symphony is written in the key of F minor, the second theme should go either to the relative major (A-flat major) or the dominant (C minor). By the time Tchaikovsky establishes the relative major, this theme has finished playing. Thus, Keller says, "the thematic second subject precedes the harmonic second subject" (italics Keller).

Movements vid :: where tchaikovsky put eulogy at end of symphony rather than the finale which was 3rd movement...
https://www.youtube.com/watch?v=4EVOJ56YgyA&t=314s
Symphony no.6 in b minor!!

^useful when thinking about ordering/naming pieces