Pick a song to play in the grammar lesson. The song should be one to which the students can relate. The song should use good pronunciation, vocabulary and grammar.
Prepare a list of vocabulary words from the song and share it with the students; the kids should listen carefully for the new vocabulary. Play the song from beginning to end at least two times so the students get a good chance to listen to it. Ask the students to write down any grammar concepts that they hear in the lyrics. Examples of grammar concepts would be verb tense, singular and plural nouns and the presence of adjectives. According to Musical Spanish, this approach will will help students attach meaning to what they hear. (See reference 1.)
Ask the students which phrases stood out in the song and to explain if the grammar elements they identified were used correctly or not. With the class, correct any incorrect grammar usage.
Ask the students to write out the lyrics to the song and correct any grammar mistakes that were identified. Sing the grammatically correct lyrics together as a group after everyone has made the recommended corrections.