If you're going to be supporting app development on Android (and you should), you might as well pay for the best content you can. That's what the Google Play App Roundup is all about. This is where you can come every week to find out what's new and cool on Android. Just follow the links to the Play Store.
You may not be a great composer, but you can probably put together a neat little tune with NOISE, a new music creation app from Roli. They make the Blocks modular music pads, and now you can use your phone to do some of the same things. This app is still in the early stages, so it's a little unstable and not all phones will work. That said, it's already a really neat experience.
There's a quick tutorial when you first open NOISE, which you ought to pay attention to. There's very little in the way of instruction within the app itself. The gist is that you have four sets of loops for each project. One is for rhythmic sounds and the other three are for the melody. Each square in the song view is a loop, which you can tap to queue up during playback. It's a little confusing, but I found it informative to play around with the pre-made sample track included with the app.
The song view is where all your loops live (you can have up to won from each line playing at a time). You can swipe down to the instrument view to make new loops. Simply tap a square to select it, then pick an instrument. All the instruments come in the form of digital touch pads, and there are a few dozen of them in the app. You can tap on the pads to produce sounds for the loop, or just drag across them. There's also a number of other effects and ways to control the nature of the sound, all of which are admittedly beyond me.
My first attempts at making songs in NOISE are… not impressive. If you've got a better sense of rhythm than I do, the app has the tools to make some cool stuff. It gives you a 4-beat count before you start recording a loop, and you can even keep a "click" going in the background to keep you on the beat. Should you own any Blocks device, you can even connect them to the app via Bluetooth.
Eventually, your creations in NOISE will be exportable to the noise.fm community. The app has a little way to go before it's ready for prime time, though. Right now, you'll need a device with robust audio processing capabilities like the Pixel, Galaxy S8 or LG G6. it's completely free if you want to give it a shot.