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. 

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.

There aren’t many alternative methods to hanging Christmas lights on fascia without using clips. But if you don’t have fascia clips to hang your Christmas lights, you can use clothespins in a pinch. To do this, hold the strand of lights in place and clip it in place with the clothespin. Using nails or staples is never a good idea, as they can damage your fascia.

Good news, Christmas lovers: you can keep your lights up all year, provided you choose the type. It's critical that you choose holiday lights made for outdoor use, as these can withstand winter weather conditions. In addition, it's best to use LED lights instead of incandescent ones. LED bulbs can withstand temperature shifts and are energy efficient. 

If you are considering leaving your holiday lights up year-round, ask your lighting installer about permanent installation. This project costs around $3,500 but gives you about six to 10 years of LED lights and adds a pleasing aesthetic to your home.