Python Introducing Lists Build an Application Multidimensional Musical Groups

am stuck in this challenge i need help

I Couldn't understand anything in the task on this coding challenge. Thanks
musical_groups = [
    ["Ad Rock", "MCA", "Mike D."],
    ["John Lennon", "Paul McCartney", "Ringo Starr", "George Harrison"],
    ["Salt", "Peppa", "Spinderella"],
    ["Rivers Cuomo", "Patrick Wilson", "Brian Bell", "Scott Shriner"],
    ["Chuck D.", "Flavor Flav", "Professor Griff", "Khari Winn", "DJ Lord"],
    ["Axl Rose", "Slash", "Duff McKagan", "Steven Adler"],
    ["Run", "DMC", "Jam Master Jay"],
# Your code here
Eric McKibbin
Eric McKibbin
11,453 Points

The challenge is asking you to to print the groups as strings with each member separated by a comma.

Your output should look like:

Ad Rock, MCA, Mike D.
John Lennon, Paul McCartney, Ringo Starr, George Harrison
Salt, Peppa, Spinderella

You need to loop through the group and join each element to a string:

for music in musical_groups:
    string = ', '.join(music)