Hi there,
While I am still new to Freelancer.com, I have over 18 years experience in Composition and Sound Design. I had a listen to the referenced Podcast and I could definitely create an epic rock type feel along those lines for you. For jingle type compositions, I usually create what I call a "toolkit" which gives you multiple variations on the them that you can use in different ways. The variations include the full theme of 60 seconds, then cut-downs and instrumentals from 3 minutes down to 3 seconds. These are useful for beds and transitions. I have quoted $100 ($111 with Freelancer fee), this allows $50 for the music production and composition and $50 to hire a singer as I do not sing myself. So, should you only require a instrumental, we could revise the quote to $50.
I hope to hear from you in this regard!
Kind Regards,
Glenn