Okay, lemme try. But my memories are kinda vague :'D
Celina Ann
Song 1: typical big ESC ballad, written with Sharon Vaughn
Song 2: more uptempo, soul-ish, written with some German composer
Dawa
Song 1: somewhat melancholic midtempo song with clapping and accordion
Song 2: a bit more uptempo with glockenspiel, both songs produced with Patrick Pulsinger
Zoe
Song 1: midtempo in German, composed with Julie Frost I think?
Song 2: Electro-swing in French, similar to 'Adieu', written together with her father
Makemakes
Song 1: Uptempo, rock-ish, retro
Song 2: Rock ballad, something between Elton John and Queen, written with Jimmy Harry
Johann Sebastian Bass
Song 1: Epic, very electronic
Song 2: Epic, both produced with I-Wolf
Folkshilfe
Song 1: Quite similar to their Round 1 song
Song 2: has English parts too, written with Julie Frost