Lemon Angel Project, Lovedol: Lovely Idol Recommendations
Both of them are about a group of girls who need to make it to the top. They also have the same amount of people and some of the characters are kinda similar. Another thing is that they're both 2006-animes which means that the drawingstyle and colors are good. I'm sure if that you liked the girls/idol/singing thing in Lovedol ~Lovely Idol~ you'll also like Lemon Angel Project!
both are about an all-girl pop group.. give these two series a crossover and there will be a showdown
Both of them are about creating another generation of an idol group, with a manager struggling to make them debut. The songs are quite good in both of the animes and each of the characters have a specific personnality. Also, their is a bit of drama in lemon angel project and its a bit more a futurist world.