Bakuman., Carole & Tuesday Recommendations
Bakuman and Carole & Tuesday are both similar in the way that they're both about 2 people who meet, become best friends, and try to make it big in the industry (manga and music respectively) together.
Both stories follow their path to fame as they try to make quality works of art to reach the world.
Both stories have a wide array of interesting side characters who also work in the field.
They both contain a rival character who you can't help but root for.
They both have a lot of insight and realistic points about the music & manga-making process.