How to make python recognize saved variables randomly selected from external file

I have a program which randomly selects and prints song names and artists from an external text file. I have split the line into an a,b format but the program won't recognize the variable once i answer the question.

file = open("Songz.txt", "r")

lines = file.readlines()

random_lines = random.choice(open("Songz.txt").readlines())

Song = random_lines

a,b=(Song.split(","))
print(a)
print(b)

Answer1 = input().upper()

if Answer1 == b:
        print(" Correct ")
        Quiz_Score = Quiz_Score + 3
else:
        print("incorrect")

Once the code reaches the if Answer1 == b:

section, the code seems to forget what value the variable (b) has. Any ideas why?