Loud café? Street noise? New Years Eve? You'll often find me listening to this: <iframe width="560" height="315" src="https://www.youtube.com/embed/WbEGmghn_jo?si=QTjMx_RdQjtq19k1" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe> Pairs nicely with noise-cancelling headphones, but works well even with cheap earbuds. At night, I'll play it from my MacBook, iPad or just my mobile phone speaker. There's no need to buy a noise machine. Some people run fans for the same purpose—also good!