Your new device has a small amount of internal memory and a large amount of storage memory. This larger section is termed as /sdcard and the contents of a physical microSD card inserted into your device is assigned the label /sdcard_ext or similar.
The android media scanner will intelligently scan thru your entire sd card (both if you have a physical card inserted too) at boot time.
You can place your music files in the following folders. YMMV due to differing versions of Android.
/sdcard/Music/ - Media scanner classifies all media found here as user music.
/sdcard/Podcasts/ - Media scanner classifies all media found here as a podcast.
/sdcard/Ringtones/ - Media scanner classifies all media found here as a ringtone.
/sdcard/Alarms/ - Media scanner classifies all media found here as an alarm sound.
/sdcard/Notifications/ - Media scanner classifies all media found here as a notification sound.
/sdcard/Pictures/ - All photos (excluding those taken with the camera).
/sdcard/Movies/ - All movies (excluding those taken with the camcorder).
/sdcard/Download/ - Miscellaneous downloads.
