Travelling with access to no external drive - show what's available now

Ok this is kinda like another unanswered post I have.
If I am travelling with my MB and want to listen to my music in itunes it still shows my entire library which is 80% not available because its on an external drive at home.
How do I get itunes to only show what is available on the laptops internal drive?

Good stuff.  Thanks.  Agree in principle re: "TBolt for displays; USB3 for storage".
I did get a USB 3 hub.  (Amazon link.  There is a 7-port hub as well.)  Highly recommended (at least for rMBP users).  This works well with how I use Aperture: I have several external drives with mostly Referenced Originals and some Libraries.  Since I rarely use more than one of these at a time, it doesn't matter that the hub throughput is limited to a single USB 3 channel.  The USB 3 hub, for me, functions as a quasi-data-server for Aperture, and takes up only one of the two USB 3 ports on the rMBP.  (Fwiw, with the rMBA I don't think there's much reason for storing Referenced Originals on a fast drive; because of the efficiency of the way Aperture caches, USB 2 may be fast enough.  I haven't measured this yet.)
I mentioned eSATA only because almost all my external drives came with eSATA ports and cables.  I have never used eSATA.  At this point, I don't plan to.
I have moved a few drives into USB 3 enclosures (purchased from OWC).  With the USB 3 hub, and the newly-available Apple TBolt-FW800 adapter (which supports daisy-chained FW devices), I am no longer in any practical way limited by the four ports on the rMBP (2x TBolt, 2x USB 3).  Whew. 
I backup my system drive wirelessly to a Time Capsule every night (by design, the machine doesn't have access to the TC during the day when I'm working), and use SuperDuper to backup all Libraries and Referenced Originals to specific sparse bundles kept on leap-frogging external drives, with one always off-site.  At this point I make no practical distinction between FW800 and USB 3 drives for back-up, as they are all fast enough and the back-ups run unattended.  (But USB 3 seems to be much faster.) 

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