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Yes, you can synchronize Christmas lights with music to create a DIY light show. To do this, you will need several components. For hardware, you'll need standard holiday lights, decorations, lawn ornaments, tools, outdoor-rated extension cords, a computer, and a light show control system or digital controller. You will also need specialized software to program the show; popular options include Light-O-Rama (LOR), Vixen, xLights, and Animated Lights. Some, like Vixen and Animated Lights, are considered more beginner-friendly. The process involves using the software to program your lights, choosing an audio method such as speakers or an FM broadcast, and testing the entire system to make sure it's working correctly before the show.

How many string lights can be on one outlet depends on a number of varying factors, including the total wattage of your circuit, the type of lights, the energy needs of the lights, and cord specifications. It’s better to play it safe here to protect your circuit, so figure out the max wattage of your circuit, compare that to the lights, and move on from there. Generally speaking, LED string lights require less energy than incandescent bulbs, translating to a higher number of lights per circuit. 

Technically, you can use duct tape to hang Christmas lights, but it’s not the best bet. Duct tape or other types of tape retain moisture, which isn’t ideal when near an electrical wire. Plus, it can peel off due to the elements. Duct tape is also a very unattractive option, visually speaking. Instead, opt for roof clips for Christmas lights, which are affordable and easy to use.

Permanent lights can save you big in labor costs down the line, as you’ll only need to invest in installing them once. As with regular lights, costs vary based on the display and the size of your home. Costs are similar to hanging regular lights, typically falling between $220 and $650.