El viernes tocamos la guitarra

Question

"El viernes tocamos la guitarra," but "Mi padre come pescado LOS viernes".I can't see the difference here?

Accepted Answer

Hola Peter
To say you do something on a specific day of the week we can use el or los (singular or plural article), but the article in singular (el) generally implies that you are talking about "this [Monday, Tuesday, Wednesday...] coming". For example, today is Friday, and I say:

El domingo voy al cine. 
On Sunday (this Sunday coming) I am going to the cinema.

When we refer to a general "On [day of the week] I do something/I usually do something", we use the plural article: los

Los domingos voy al cine. 
On Sundays (every Sunday) I go to the cinema.

This is the difference in these two sentences:

El viernes tocamos la guitarra.
On Friday {this Friday} we are playing the guitar.
Mi padre come pescado los viernes.
My dad usually eats fish on Fridays (every Friday).

I hope this clarified it.
Saludos