When MercyMe played at Carpenters Home Church, they had interviews set up from the time they arrived to the time they left. HolyPOW was able to snag an interview with Jim Bryson who plays the keys while the others were in another interview. You can here the whole interview by clicking the link above.
Also, here are some excerpts from the MercyMe web site.

Some might argue that the modern praise and worship explosion has been co-opted by marketing schemes and promotional plans. But for the men of MercyMe-Millard (vocals), Jim Bryson (keys), Mike Scheuchzer (guitar), Nathan Cochran (bass) and Robby Shaffer (drums)-worshipping the Lord and leading others in His praise is very much a life-long calling.

Bart says the band's goals for the ministry of MercyMe are quite simple.
      "I pray that God would use us like psalmists-it would be an immense privilege to think that a song we write might outlive this band. I pray that when people look at these five men, they see the hand of God. We want to lead people to His throne through worship. It's not about us. Any time I can step away from the microphone and listen to the body of Christ sing, I'll do it. I'd rather hear that than hear myself sing any day of the week. We hope to be doing this when praise and worship isn't 'popular' anymore-but why shouldn't it continue to be? It's the reason we were created."

Behind the Music: I Can Only Imagine

   When my father died of cancer in 1991, he left me with the assurance that he was headed to a better place. He used to always tell me that I was getting the raw end of the deal because I had to stick around here. For several years following his death, I would find myself writing the phrase, I can only imagine, on anything I could find. That simple phrase would give me a peace and a hope thinking about what my dad was finally experiencing.

   Years later, in 1999, MercyMe was writing songs for an independent project. I remember coming home from a show and being wide awake on our bus at 2 o'clock in the morning. I was trying to write lyrics in an old notebook of mine, when all of a sudden, I stumbled across that phrase. About ten minutes later, the song was written. Some people say it's amazing that it was written in ten minutes, when really it had been on my heart for almost ten years.

   As a worship leader I am constantly wondering if the most precious times of worship here on earth, are even close to what we will experience in the Kingdom of God. I personally believe we are merely scraping the heavens here. I grew up in church and was taught to worship a certain way, but even still I wonder how I might react when the day comes and I physically lay eyes on Jesus. I bet there will be a lot of Southern Baptists that can't sit still, and a lot of Charismatics that are speechless.