Yes, the device has 64 MB of on-board memory which isn't a lot.
You should get a Media Card for music. Be sure that you get one supported by the OS version on the device.
What type and size Media Card can I use in my device? - BlackBerryFAQ
BlackBerry Device Software -- Media Card Size Limit
BlackBerry Device Software 4.2.0 -- Up to 2 GB
BlackBerry Device Software 4.2.1 -- Up to 4 GB
BlackBerry Device Software 4.2.2 -- Up to 4 GB
BlackBerry Device Software 4.3.0 -- Up to 8 GB
BlackBerry Device Software 4.5.0 -- Up to 8 GB
BlackBerry Device Software 4.5.0.81 and above -- Up to 16 GB