Murica are a rock pop band from Leicestershire UK who pride themselves on achieving a big sound from very little. Primarily they are 3 guys, Ben, Ryan and Josh - but they work with other musicians based on what a given song might need. Josh generally does the inception of a song idea, writes the lyrics (and sings them) and Ben will produce it, add drums/ guitar/ synth etc. then when it's nearly done Ryan will lay the Bass down.
They usually draft in help from friends if there's something they can't do, like add a trumpet part, an insane solo beyond their primitive capabilities or a super deep voice! Ben has a poky home studio somewhere near Leicestershire that they use to churn out the tunes.