Where does the comma go? MGMT’s music is infused with electronic beats catchy lyrics and a pop-friendly sound.

The comma should go after "electronic beats".

Explanation:

MGMT’s music is infused with electronic beats, catchy lyrics and a pop-friendly sound.

If you'd like to go the extra step, you can use an oxford comma, which goes before the "and," and place it after "catchy lyrics".

MGMT’s music is infused with electronic beats, catchy lyrics, and a pop-friendly sound.

Both sentences are grammatically correct.

a: that she is losing interest in her relationship with arobin just took !