1. Use a music downloader app
There are a number of music downloader apps available for both Android and iOS devices. These apps allow you to search for and download music from a variety of sources, including YouTube, SoundCloud, and other streaming services. Some popular music downloader apps include:
* Android:
* [SnapTube](https://www.snaptubeapp.com/)
* [TubeMate](https://www.tubemate-free.net/)
* [YMusic](https://ymusic.io/)
* iOS:
* [Documents by Readdle](https://apps.apple.com/us/app/documents-by-readdle/id364901807)
* [iDownloader](https://apps.apple.com/us/app/idownloader-download-media/id911169624)
* [Downloader Pro](https://apps.apple.com/us/app/downloader-pro/id404969478)
2. Use a web browser
You can also download music from the internet using a web browser. To do this, simply search for the song you want to download and click on the "Download" button. The song will then be downloaded to your device.
3. Use a file transfer service
If you have a file transfer service such as Dropbox or Google Drive, you can also use it to download music from the internet. Simply upload the music files to your file transfer service and then download them to your mobile device.
4. Use a torrent client
If you are familiar with torrents, you can also use a torrent client to download music from the internet. To do this, simply find a torrent for the song you want to download and then use your torrent client to download the file.
Once you have downloaded the music to your mobile device, you can play it using a music player app. Some popular music player apps include:
* Android:
* [Google Play Music](https://play.google.com/music)
* [Spotify](https://www.spotify.com/)
* [Apple Music](https://www.apple.com/music/)
* iOS:
* [Apple Music](https://www.apple.com/music/)
* [Spotify](https://www.spotify.com/)
* [Pandora](https://www.pandora.com/)