tocaba la guitarra y

was playing the guitar and

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phrase Rare #37,888
was playing the guitar and Uses the imperfect tense, so it describes an ongoing or repeated action in the past.
SP: Mi hermano tocaba la guitarra y yo cantaba.
EN: My brother was playing the guitar and I was singing.

Juan tocaba la guitarra y sus amigos cantaban.

Juan played the guitar and his friends sang.

Él tocaba la guitarra y ella tocaba el piano.

He played the guitar and she played the piano.

Delante de la fuente una chica tocaba la guitarra y cantaba.

In front of the fountain, a girl was playing the guitar and singing.

John tocaba la guitarra y sus amigos cantaban.

John played the guitar and his friends sang.