If you're looking for manga similar to Prayers, you might like these titles.
In the future, when music becomes illegal, an illegal hacker singer enters the stage. From the first strum of the guitar, the world will never be quiet again.
Vivacious Neo loves to sing and test the boundaries of 23rd-century modesty with her short, short skirts. When she accidently time-travels back to the 21st century, it's time to sink or sing! Before she knows it, she's teamed up with the handsome Saya as half of the ultimate singing duo. But all her dreams may vanish if they can't put on one great concert. With Saya depending on her, will Neo keep time on her side?
A year after the resolution of the fight with the Protodeviln, the band Firebomber's Mylene F. Jenius (now 16 years old) is still conflicted about her feelings for lead vocalist Nekki Basara and wavering in her strength as a musician/vocalist. Acting on her desire to be on equal footing with Basara, Mylene takes an opportunity to perform with the group Jamming Angels as lead vocalist. With a television producer holding an ulterior motive, a clandestine military project, and Basara heading off into the galaxy, this action marks the start of a path that she would never have guessed.
Colin had watched helplessly as his beautiful brother and popular top student, Abel, drowned at sea during a freak storm. So he is totally relieved when Abel later reappears only to find out that an alien life form has entered his body, turning his personality topsy-turvy and high-strung! Dark secrets about the real Abel surface, aggravated even more by the discovery that he is now a receptive channel for the musical genius of their new and mysterious music teacher.