Learn English – Is “I too am okay” grammatically correct

Well, to address your concern about why we need the source, before you provided the ad, I thought it was a play on words. Pleats almost sounds like beats and music certainly has beats.

However, now that we have the source, we notice that there is sharply dress man (the one who asks "Four pleats?") and the other guy. Instead of telling the other guy that his sense of style is poor, he takes him to car, plays the first track and asks, "How many pleats does this song have?" In other words

How many pleats are these guys wearing?

None. He plays the next song and asks about their pleats. In other words

How many pleats are these people wearing?

The song is "It's a Sunshine Day" performed by The Brady bunch

How many pleats did they wear? (Presumably the men.) Four.

Hence, the sharply dressed man is implying that the other guy's sense of style is out of date. By association, we understand that the car being promoted is cool and sleek, like the sharply dressed man, by today's standards.

By the way, the 4/4 thing is called a time signature.

Where have you been all these days? is an expression that can be a direct question that is asking where the person has been, or what the person has been doing.

It can also be an indirect (implied question) that is stating that you have missed the person. Some might also use the expression because they are annoyed that the person hasn't been around for a long time.

In each case the meaning is altered by the way the expression is asked using a different tone and inflection in your voice.

The answer (in your memory) doesn't make much sense to me and I have never heard that reply.

A more usual reply from your friend might be:

I've been away on business, but you have been in my thoughts.

Another reply could be:

I've been away on business, but I've been thinking of you.