Oh and just a little background on Taxi, for those that are too lazy to research it.
All information is from Taxi.com
Record labels, Publishers and Film & TV Music Supervisors tell them what kind of Songs, Instrumental Tracks and Artists they currently need - then they tell you. When you see a match for your music, you send it to them, and their A&R team pre-screens it for the company that needs it.
There is a $5 submission fee. This is for ANY submission. You are only allowed or encouraged to submit your music if it fits the criteria they describe. (This could be never, depending on what type of music you write. I doubt Metal is ever requested, for example) They claim that there are around 1200 opportunities (requests) per year - that's 100 a month. Of all of these, your genre may be 3-10%, depending on the popularity of that genre. That means you have 3 to 10 opportunities to submit your work in a month. Keep in mind that 10 is the absolute most. It's more likely that your song's genre may not be picked at all during any given month, and maybe chosen ten times one month.
However, even with an entire ten "chances" to get your song placed in a movie/TV show, there is little hope, considering the other 5K (estimation) members that are submitting their work for the very same opportunity. Even if your song is "better" than all of the rest, it could be that they are looking for a specific sound or feel.
There is a 300 dollar yearly membership fee, which they claim is ridiculously low (of course, it's not coming out of THEIR pockets). They compare it to using a music attorney for an hour or a flight to L.A.
They say they give you professional feedback on the songs you submit. But after looking over their example, it's not very detailed, and lacks anything truly helpful.