Help with the structure of streaming app with Google Cloud Platform

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Mobile

Android

Google

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Hey guys I want to make a music streaming mobile app using Google's cloud platform and I needed some help regarding the tools I'd be using. The features of the app are going to be simple:
- A huge database of songs
- People can search for songs and stream them
- Basic music player functionality
- Recommend songs, like, share on facebook etc

I get the fact that the songs will be simply uploaded to a storage bucket but how will I create a database containing all the info of the songs? And how will that database be linked to the items in the bucket so that when I query the database, it returns me a reference to the item in the bucket which I can then stream on the app?

I just need someone to point me in the right direction.
Thanks.