I have some suggestions ;):
-collaborations with bands,
-being able to create solo singles/albums of our bands' members,
-our bands' members should be on the list of our artist so that we could do more with them,
-we should be able to do coaching of them and it should increase stats of this artist's band,
-creating a bands in the game(not auditions, but existing artists)
-a general increase of the sales (I know that we can edit it ourselves, but in my opinion it should be bigger in the game from the beggining)
-more video views (nowadays biggest hits easily reach 1kk views),
-you may add youtube subscribes, overall youtube views of the artist/band or something like that,
-continuous views of videos (views shouldn't fall to zero daily),
-we should be able to choose release dates of videos,
-increase in the views of old videos when artist is releasing new video or gaining followers,
-the increase of fans (social media) should be bigger when artist or band have just released a big hit,
-the demanded amount to buy out artist contract may be higher,
-we should be able to do a remix of produced song,
-events like meeting with fans,
-interviews, photo sessions etc.
-fewer relationships with a big age gap, and more from the same country,
-labels should be able to buy shares of other labels,
-we shouldn't be able to book artist/band on too many TV shows in one day and few times to the same show in one day (screen1) and choose the date when max artist/bands are booked(screenshot2).
-sending chosen band members to tv shows,
-the date of debut in artist's/band's information,
-biggest hit in artist info,
-we should be able to choose country or countries in tour location or criteria when the game picks arenas for you,
-now we must set filters every time when we are picking each arena,
-there is a bug with picking areas, we can't select arena in few positions (screenshot4 for example)
-you may fix release dates of artists/bands (screenshot3),
-please fix bug with retirements-dissapearing artists/bands (I know that you wrote that you will fix it, but I remind you because actually it's the biggest problem for me in the game),
sorry if my english is poor, I hope that you will understand my suggestions :P