>>1731747No need to be rude anon, bikes often come in multiple color schemes per model year, and there's no guarantee the search results for the model you've specified will match your bike.
Assuming it is the same as the picture earlier in the thread, I think you should stick with black tape/black saddle. Orange or maybe red would be acceptable, but it's hard to beat black and yellow as a combo. Here's another bike in that colorway for comparison.
>>1731749Any 5-8 speed chain will work. Doing a quick search online for one in gold I don't see any from KMC or other known brands, but there's one from a Chinese mystery brand on Amazon in that color and that's probably okay.
>>1731696As others have said, earbuds. If you really must play music for others, it should be while rolling slowly as part of a big parade style event (think critical mass, ciclovia) and in that case the best solution is a trailer with a boombox.