Berlioz sounds more complex, pathos, bravura, realistic, experimental for his time, although he is 35 years older.

Schumann sounds more calm, grief.

Only Schumann has organ, requiem, piano, cello concerto. (Berlioz, Schumann)

Both have a very intimate, personal and very passionate, expressive style to their music.

Schubert sounds more light, melodic, closer to Mozart.

Schumann sounds more harmonic, calm, grief.

Schumann was willing to go farther in baring his soul - he did not disdain even awkwardness if it better conveyed the emotion he wanted to express.

Schubert was expressive and intimate, too - but he played by the rules a lot more.

Only Schubert has string quartet, piano quintet, piano trio.

Only Schumann has piano concerto, cello concerto, organ, requiem. (Schubert, Schumann)

Mendelssohn sounds closer to Beethoven (more repetitive, simple melodic), light, cold.

Schumann sounds more romantic, sweeping, wide, pleasant, balanced, grief, less melody, more symphony.

Only Schumann has canons for organ, requiem, piano concerto, piano songs, cello concerto.

Only Mendelssohn has adagio for organ, piano trio, violin concerto, octet. (Mendelssohn, Schumann)

Although Haydn is classical and Schumann is romantic, sometimes Haydn will sound more expressive and Schumann will be repetitive and simple. Also, listen to Schumann Requiem.

Detecting simple harmony can help to separate Haydn. (Haydn, Schumann)