The laptop model you have selected can do these type of work easily without any frustration and much time. Adding music and changing color is not a heavy task at all. Lookign at your laptop specs it feels like you are assigning a task to a mathematician to solve 10+10.
If your country has this thing available at low price then just grab it.
But again I'm reminding you if you want an ultrabook then look for something like Ryzen 5 or Ryzen 7 equivalent (like R5 4500U or R7 one, but only consider the 4th gen of ryzen) because they would be cheaper and more powerful than intel. For example at the price point you are getting a 4 core intel cpu, at that same price point you can easily get an AMD 6 core cpu.
So again I'm asking you about your budget and country, so it would be easier for me to pick any one model for you.
Still if you are interested in Intel then go and grab it, its not even that bad and the other specs of legion is just too good, but you should really find any other model of the legion with all those same specs except for processor and search for AMD Ryzen 7(8 core, 16 thread) or Ryzen 5 H series(6 core, 12 thread) is just better than the i7 10750H (6 core, 12 thread ).