Views – group by and aggregation

Hello!
In a singer site I’m building there is a concert event list.
each concert has several dates.
for example:
concert name x – 13/9/16, 15/9/16, 16/9/16
concert name y – 14/9/16, 14/10/16

I need the final result to be like that:

SEPTEMBER
13/9/16, 15/9/16, 16/9/16 – concert name x
14/9/16 – concert name y
OCTOBER
14/10/16 – concert name y

I created a new content type for that which contains the concert title, date field (multiple).
In views I managed to sort by months using aggregation on but the output is like that:
SEPTEMBER
13/9/16 – concert name x
15/9/16 – concert name x
16/9/16 – concert name x
14/9/16 – concert name y
OCTOBER
14/10/16 – concert name y

how can I group similar titles dates??

Thank you!

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