The sight of Novak Djokovic tuning up his instrument is music to his fans' ears.

The former world No. 1 posted video of himself hitting at the Piatti Tennis Center.

"Tuning up my guitar," Djokovic captioned his Instagram and Facebook posts of his hitting session.

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The Piatti Tennis Center, headed by former Milos Raonic coach Riccardo Piatti, responded with this Facebook post.

"Thank you Nole!!! We hope your guitar is nicely tuned now," the Piatti Center posted.

It is believed to be the first time the 12-time Grand Slam champion has hit since undergoing what he called "a small medical intervention on my elbow" earlier this month.

The former world No. 1, who is now ranked No. 13, has not cited a schedule for his return to tournament tennis as he continues to strengthen his right elbow.

Photo credit: Mark Peterson/Corleve