Musicians

Rihanna is doing nothing but work, work, work, work, work ... sharing a new video from inside the studio -- and fans are hoping it’s a sign fresh tunes are finally on the way.

RiRi took to social media Thursday to show a glimpse of her packed schedule ... kicking things off with a late-night meeting with her Savage x Fenty team. The session stretches deep into the night, with Rihanna seen reviewing ideas and signing off on concepts.

Then, just after 2 AM, it’s off to the studio.

Rihanna looks fully locked in ... working the mixing board, scribbling notes, and vibing out in the booth. There’s no audio in the clip, but that hasn’t stopped the fans from spiraling ... lighting up the comment section elated about potential new music.

Looks like Justin Bieber’s in rehearsal mode for Coachella ... utilizing a casual furniture run as the perfect space for an impromptu sound check.

Check out this video of JB fully in his zone inside Downtown L.A.’s Deep House Design Store earlier this week ... hopping on the piano and the drums to test them out inside the music showroom after rolling in with his friends.

Witnesses tell TMZ he basically put on an impromptu concert for about three customers and the staff -- hey, a crowd’s a crowd!