I can't start the music. He only plays a certain number of songs .

[#1]

Previously downloaded songs are not played only by a certain number of songs . How many songs can I have on my playlist?

[MartinT]

Heya, 

Thanks for reaching out to the Community!

We'd be happy to help out but we would need some more info on what exactly you are experiencing. Do you experience this with all downloaded songs or does it occur at random? As for the number of songs on a playlist, technically the maximum number is 10,000 although we would not recommend trying to reach that number as it may impact the performance of the app. 

Well be on the lookout for your response,

Cheers.