It’s not technically classical, instead it’s orchestral, but the score from Interstellar is a really good doodling soundtrack.

Favorites of mine are:

Beethoven: Symphony #7, 2nd movement

Bach: Brandenburg Concertos

Pretty much any symphony or piano concerto by Mozart or Haydn.

Piano works by Chopin, Satie, Mozart, Beethoven

Honestly, I’m a classically trained musician, so I almost never put on classical music for background noise - I tune in and listen out of sheer habit.

I like Philip Glass. Yeah his name is a punchline but I find his sense of harmony and melody pleasant to listen to. I recommend his violin concerto. If you like vocal music I recommend renaissance motets (anything by Tomás Luis de Victoria for starters).

If you like a challenge take a listen to Stravinsky. If you wanna hear what it’s like to be a combat veteran try Xenakis.

A lot of classical music most people are exposed to are single movements within a larger composition. Listening to whole symphonies/concertos/suites/etc gives you a consistent vibe for 20-45 mins.

Some I like:

Violin Concerto in E Minor Op 64 - Felix Mendelssohn

Violin Concerto #5 in A Major, K219- Mozart

Symphony #2 in D Major - Jean Sibelius

Cello Suite #1 in G Major - J.S. Bach

Moonlight Sonata - Beethoven

Miserei Mei Deus - Gregorio Allegri (has an interesting story)

Glenn Gould is a standby. Solo piano is very relaxing.

I dont really have favorites, but I do like to find a playlist of classical music on Spotify and play that in the background.

I also like to find string quartets that cover modern songs. Vitamin String Quartet and Piano Tribute Players have quite a few to check out.

Technically baroque, but Bach’s lute suites are incredible.

Depends on your definition of “Classic”. For relaxing background music I like “Waiting for Custeau” by Jean Michel Jarrett.

Anything Neo Classical.