Android - How to change the default alarm sound?

Oddly enough, Android doesn't provide (as of the time of writing) a way to change the default alarm tone: if you navigate to Settings > Sound & notification, you can pick "Alarm volume", "Phone ringtone" and even "Default notification ringtone", but there's nothing about an "Default alarm ringtone".

The solution that worked for me came from this post. It requires using the ES File Explorer (install it if you don't have it yet, you can remove it afterwards). The steps below are to pick one of the existing alarm sounds as the default one, but can be used for any sound in your SD card. Here's what you do:

• Using the ES File Explorer, navigate to /system/media/audio/alarms
• Click on the file you want, and in the "Open with" prompt, select "ES Media Player"
• Open the menu in the top right, and pick "Set ringtone" (the entry with a bell icon)
• In the dialog that appears, pick "Set alarm"

After doing this, all applications that use alarms will use the chosen sound if they're configured to use the system default. The stock clock app will also use this.

Once you move your song or ringtone into the file you have created and you click on it and file explorer if you push the three dots on the top right it'll say set ringtone push that and it'll give you the three options shown in the picture!