YouTube to MP3 Converter is a free (and ad-free) program that downloads videos from YouTube, Vimeo, SoundCloud, Dailymotion, Bandcamp, HypeMachine, Mix Cloud, VEVO and many others so you can listen to them offline. It's easy to use and runs on Windows, macOS and Linux. Convert youtube video to mp3.
If you enjoy music videos and want to listen to them offline this app makes it fast and easy. While there are online websites that convert YouTube and other videos to MP3's, the ads and pop ups often lead to questionable sites and the quality isn't that great. This program is ad-free, easy to use, produces better quality MP3's, runs on multiple platforms, and has a portable version. Among its features are the ability to save files in M4A, MP3, and OGG formats, choosing bit rate and quality, tag editing, drag and drop, clipboard support, a multilingual interface, iTunes playlist support, and supports downloading videos from numerous websites.
I usually check the licensing on any videos I want to download and I either purchase the music or delete it after downloading. While streaming videos is usually not an issue, downloading videos is a murky legal area. You can find out more here:
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YouTube to MP3 Converter runs on: Windows 10, Windows 8, Windows 7, Windows Vista, Windows 2003, Windows XP for PC systems (32bit/64bit), macOS 10.13 (High Sierra), macOS 10.12 (Sierra), OS X 10.11 (El Capitan), OS X 10.10 (Yosemite), OS X 10.9 (Mavericks), OS X 10.8 (Mountain Lion), Mac OS X 10.7 (Lion), Mac OS X 10.6 (Snow Leopard), Ubuntu Linux 14.04+.
It's a small download (around 28Mb, depending on platform) and is free of malware according to Virus Total.