3 suggestions:

"Library Background Noise for Relaxation"

https://www.youtube.com/watch?v=aTm2oQRsISk

"DISTANT TRAINS ECHOING IN THE RAIN.. Relaxing SoundScape to help Sleep, Study & Meditate"

https://www.youtube.com/watch?v=iTXoxV-MFMo

"One Hour of HQ Coffee Shop Background Noise"

https://www.youtube.com/watch?v=BOdLmxy06H0

brain.fm is great, too!

But honestly, silence + just getting into the groove works best. Minimizing distractions is key. Unfortunately, nothing beats late nights at meeting these criteria.