EXAMPLE 1:
You bought a lot of 25 country CDs, and a lot of 50 country CDs.
Note that you will not receive 75 different titles.
The 25 CDs will be either entirely or in part also included in the 50 CD lot as well.

EXAMPLE 2:
You bought 2 lots of 60 jazz CDs.
Note that you will not receive 120 different titles.
The 2 lots will most likely be identical, or almost identical.
While some titles may vary from one lot to another,
you would probably not receive much more than 60 different titles in the 2 lots.

EXAMPLE 3:
You bought a lot of 9 country karaoke CDs and a lot of 92 mixed-genre karaoke CDs.
Most likely several of the titles from the country lot will be also included in the 92 mixed genre CD lot.

EXAMPLE 4:
You bought a lot of 100 rock CDs, and several individually listed rock CDs.
There is a possibility that some of the individually listed CDs will be also part of the 100 CD lot.

EXAMPLE 5:
You bought a lot of 100 CDs that already includes titles duplicates.
And so instead of 100 different titles you may receive, for instance, 50 different titles with 1 - 5 copies per title.
Each lot will have all such information clearly stated in the description.