Didn't mike mention in an interview that this was an unfinished song and he forgot about it(Forgot about Chester's parts of the song to be more precise)? They most likely were done with the 12 songs that's why the rest of the songs never went past the Demo stage(Excluding lost) hence, they didn't release songs like FM or MTV as opposed to them sounding similar to other songs on the album. Though I will say, FM is a lot better than some of the songs on meteora. Especially, The bridge part is a standout. It adds a whole lot to the song. Unlike most other songs that sound repetitive at times.