For a limited time, companies like Moog and KORG are providing free downloads of their synthesizer apps. This allows you to create music simply by using your smart phone or tablet. Some of the listed apps are already free, such as the Reason Compact or TF& Synth. You'll be amazed at how easy they are to use!
The cool thing about working with these apps is that even without music theory experience you can create simple chord progressions and melodies. Create sweeping lead and bass lines. Add some percussion even a drum beat. Then shift the sounds with various knobs labeled "filter" or "distortion." Allow your imagination to run free!
The next step after creating your music is to edit the tracks in an audio production software. Many of times, you can export your music files directly to the software of your choosing. The following options have either free "lite" versions or require purchasing. Check for educational versions or other discount options. You can also use the Bandlab app which allows you to collaborate with musicians remotely.