On an Android phone there is a notification ringtone which will be used by default for all notifications. The Gmail app allows you to specify a different notification ringtone which can be quite useful for having the default for SMS messages and something else for new emails, but the option is buried quite deep and I can never remember where it is, so this post will help to remind me in the future.
Default notification ringtone
The default notification ringtone for all apps etc is at:
Android Setttings -> Sound -> Notification Ringtone
This will be used for everything unless specified differently in each app, when it can be specified in the app. As I mentioned above, this can be useful in the case of Gmail for having a different notification ringtone for email than the default, which will be used for text messages.
Gmail notification ringtone
You can specify a different notification ringtone for each account and it’s buried quite deep in the app settings. When I wanted to change it myself yesterday, it took a while to work out where it was.
Gmail App -> Menu -> More -> Settings -> [Account Name] -> Labels to notify -> Inbox
Phew, and now you can set it by touching the "Ringtone" setting.