Further down the line, you could always commission someone to create a piece of music for you but when starting off picking up royalty-free music from the likes of AudioJungle will do the trick.
I picked up my soundtrack over at AudioJungle for about £15, there are thousands of tracks to choose from that can deliver the sound you are looking for. Further down the line, you could always commission someone to create a piece of music for you but when starting off picking up royalty-free music from the likes of AudioJungle will do the trick.