If you want ambient background noise I can't recommend this site enough - dozens of constantly varying soundscape generators...
All the samples are designed so you never get repetition and you can adjust the frequency balance for optimal distraction blocking (because Janet in Accounts has a voice that occupies 10KHz...)
If you donate a bit of £/$ (no minimum), it helps pay for the bandwidth and support the guy who runs it. He's sourcing sounds in person and everything is top quality.
When I need to focus (designing an algorithm for example) I'll have this on. Otherwise if it's straightforward plugging Bootstrap templates together Chillstep/Chillhop/Vocal Trance makes me code a bit faster :)
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.