I am currently using Smb4k to auto-mount my Samba share (a 2TB hard drive plugged into my router USB port). The music collection is only a few hundred GBs. I've tried adding my music collection to a number of different apps, so far with no luck.
I have tried:
1) Clementine 2) Exaile 3) Spotify
The issues with each are:
1) File loading never completes. Even after waiting days. It approaches 90% and then the percentage complete begins dropping. I have no idea why this is happening
2) Exaile is just buggy. The files seem to eventually load (well, I have only tried the albums starting with "A") but even with this small collection loaded I have interrupted music playback and frequent fading out of the app GUI (while it 'thinks')
3) Spotify just doesn't seem to scan the mounted share at all. I can't get anywhere, which is a shame.. as it's a great way to catalog your collection with the additional online resource in one searchable library.
Playback through Audacious works fine when I drop in a folder from the mounted share. The playback seems relatively flawless and snappy.