Seems like you pretty much get it.- Beethoven was influenced a lot by Haydn (I believe he even wrote his 2nd sonata, which you play, while studying under him) - in terms of using the sonata form, theme developement, musical textures, modulations and harmonic progressions. If you listen to some of his early sonatas you'll see a distinct Haydn presence. I think Haydn gave him the basic tools to writing piano sonatas, which he later developed to his own unique style.- Mozart was a huge force of nature when Beethoven was a teenager, and he drew plenty of inspiration from his music. Again - Mozart was an example of a composer with great talent for theme developement, classical textures, lyrical sensitivity, and most importantly - atmosphere. You can especially tell the influence from Mozart in his piano concertos. While Haydn gave him the basic tools for composing (as a teacher), I think Mozart was sort of an Idol who gave Beethoven the more personal aspects of his music - flare, warmness...- Beethoven studied Bach's style almost like a religion. He was a big fan of counterpoint (something you can see both in his early and late periods - polyphonic textures, fugues, etc) and of Bach's ideas of harmonic functions (though, TBH, who isn't?! Everybody used it as the time...) so it's natural to see plenty of Bach-like elements in his music - sometimes out in the open, and sometimes more hidden.These are the main ones, I think.
And, do you have any idea about specific pieces which he used as a model?Thanks again.
I also remember reading some time ago that he intensively studied Palestrina's oeuvre, before he set to work on the majestic 'Missa Solemnis'.
The music of Messiah so permeated Beethoven's being that on his deathbed he is reputed to have quoted from The Messiah"