This mod is not made by me, credit goes to: https://steamcommunity.com/sharedfiles/filedetails/?id=730460799
Description from Steam: This mod allows you to use every instrument with only one hand.
Finally you can fight epic battles with one hand while playing epic music with the other one!
WARNING: Do not use two instruments simultaneously! That is bugged and causes problems in MP servers to other players as well, that could lead to moderation action.
Works with Starbound 1.3.3
Alternative download link: Non-Steam Version