Good question, just looked that up. Here's what I found........

This was written by Robert Lamm, who is a keyboard player and singer for Chicago. It's about trying to write a song, with the title referring to the time of day: either 3:35 a.m. (25 to 4) or 3:34 a.m. (26 to 4). Lamm explained on The Chris Isaak Hour: "I was living with a bunch of hippies up above Sunset Strip. One of the advantages of this particular house was that it was in the Hollywood Hills and I could look out over the city late at night. I wanted to try to describe the process of writing the song that I was writing. So, 'waiting for the break of day, searching for something to say, flashing lights against the sky' - there was a neon sign across the city. That song came from the fact that it was 25 or 6 to 4 a.m. in the morning when I looked at my watch - I was looking for a line to finish the chorus.

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