Optimisation

[buran]

as if I was to press enter it would of course execute the line of code so far

That is when you use interactive mode/shell (i.e. that is when you have >>>). Each line is evaluated immediately.
You should write your code and save it as file with py extension. In this case each statement will be on separate line

song = input("What is your favourite song?\n")
line1 = input("What\'s the first line?\n")
line2 = input("And the second?\n")
line3 = input("Finally, the third line?\n")
print(f"\n{song}\n{line1},\n{line2},\n{line3}")

Now there are other issues with your code (although it runs), but it's because there are better ways to do what you are doing here

look at https://python-forum.io/Thread-How-to-Ex...ython-code