Mozart sounds more classical, clear, structural, repetitive.

Mendelssohn sounds more romantic, expressive.

Only Mozart has clarinet concerto, flute concerto, piano concerto, clarinet quintet, horn quintet, string quartet, requiem, horn concerto. (Mendelssohn, Mozart)

Mendelssohn sounds more classical, repetitive, compressed, simple melodic, rhythmic, light, cold.

Brahms sounds more romantic, expressive, sweeping, serious, rich, mellow, emotional, sometimes dancing.

Only Mendelssohn has opera, organ, string octet.

Only Brahms has requiem, piano song, violin sonata, clarinet quintet. (Brahms, Mendelssohn)

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

Chopin sounds more romantic: either more dark or more dance. Piano pieces sound more technical, fast, rolling, tender.

Beware that piano pieces of both composers sometimes sound song-like.

Chopin has solo piano and piano concerto.

Mendelssohn has everything else and does not have piano concerto. (Chopin, Mendelssohn)

Haydn sounds more regular, classical.

Mendelssohn sounds more expressive, romantic.

Only Haydn has string quartet, trumpet concerto, opera, cello concerto, messa.

Only Mendelssohn has piano trio, organ, string octet. (Haydn, Mendelssohn)

Schubert sounds more simple, regular.

Mendelssohn sounds more romantic, light, delicate.

Only Schubert has string quartet, piano song.

Only Mendelssohn has opera, violin concerto, organ, string octet. (Mendelssohn, Schubert)

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)

Beethoven sounds more repetitive and serious.

Mendelssohn usually sounds more light, romantic.

Only Beethoven has messa, string quartet, piano concerto, violin sonata (but Mendelssohn has piano trio).

Only Mendelssohn has organ. (Beethoven, Mendelssohn)

This is a comparison of romantic Mendelssohn and late romantic Tchaikovsky.

Mendelssohn sounds conservative, cold, closer to classical.

Tchaikovsky sounds more sweeping, dance, folklore, song-like.

Beware of Mendelssohn Hebrides, which can sound more romantic. Mendelssohn Songs without words sound like piano playing a vocal part. (Mendelssohn, Tchaikovsky)

Comparing Bruckner and Mendelssohn, I continue to be surprised by the tenderness of some melodies of Bruckner. I think of his music as being radical, but it is not always so. (Bruckner, Mendelssohn)