It's not currently possible to sort the list based on Source. If you tap the Sort: A-Z option at the top right, you can see the available sorting options.
This is a more complex way to achieve this though - Go to Settings->Library Settings->Song Title Formatting, change the format string to put the Source field at the start before the title, and then make sure to check the option to use formatted titles for sorting. That would effectively sort all your songs by source when sorting alphabetically.
Mike
This is a more complex way to achieve this though - Go to Settings->Library Settings->Song Title Formatting, change the format string to put the Source field at the start before the title, and then make sure to check the option to use formatted titles for sorting. That would effectively sort all your songs by source when sorting alphabetically.
Mike