FAQ

I assume you are asking why it isn't in widescreen (16:9 format). When the series began in 2001 Hi-Def television was just starting to be implemented. Transmitting Hi-Def required a digital system and was a major upgrade to both television stations and studios. It wasn't until years later that Hi-Def television and the widescreen format that came with it became standard. If it was filmed in a widescreen format It should be pretty simple to do the transfer to the Hi-Def widescreen format. I don't know if it was.

"Breathe Me" by Sia

Yes, but the way in which this is true is a matter of opinion;

One Interpretation The dead appear as ghosts to the characters to discuss certain topics throughout the storyline. (i.e. Nathaniel appears to every member of the family to talk about what's on their mind)

Another Interpretation The bodies are dead and gone, it is only the conscience and thoughts of the characters projected through the body they are thinking about. Usually giving contrasting advice or opinions to the person imagining them. Think of the devil and angel on each shoulder, for example; When David is embalming the young gay man who was beaten to death in the first season, the man keeps telling Dave he's going to burn in hell and Dave will too. (this is what Dave is thinking, and projects it through images of the deceased telling him) Whereas Dave is arguing this point and denies he feels that way.

More evidence leans towards the latter interpretation, if everyone in the family was visted by the ghost of Nathaniel or other characters, they would probably mention it to each other, or all see him at the same time. Also Rico who is no blood relation to the Fishers, also has conversations with the dead. It is probably common for a mortician to talk to the body they are working on,(as it is a very stressfull and solitary job..on the show anyway) so the show incorporates that, but instead of just having the actor have a conversation with a dead body, the show projects the dead body talking back, when this isn't actually happening.

The way in which certain people die will affect certain characters' thoughts, thus haunting them. Such as the infant dying of SIDS deeply troubles Rico as his wife was pregnant at the time, the gay man beaten to death really haunts David, etc.

You can find a list of the music from the show here: http://tvshowmusic.com/shows/six-feet-under-music-season-1

That particular song is "Breathe" by Sia.