So I have a USB bluetooth headset. I am a coder. I sit at at a desk all day with the headphones on. The headphones are Bluetooth. I have a USB adapter for the computer. I listen to my MP3s on the computer all day everyday. Up till now I switch headphones to listen to my MP3. But, no longer. Now I am using one bluetooth set of headphones. But only one set. I took a simple male to male 1/8 inch audio cable and hooked one end into my MP3 playerand the other end into my computer’s MIC jack. This dell PC has a MIC jack on the front of the PC. I could have easily used the AUX (line in) on the sound card in the back but the front MIC jack was just convenient. Then in Windows it was just a matter of enabling (unmuting) the MIC in Volume control in Control panel. I pop on my headphones and I am good to go. The added benefit is I can play the MP3 player and the MUSIC from the computer at the same time and control each volume independently. Why would you want to do this you may ask? Well I listen to instrumental music most of the time. I like classical film scores. John Williams, Howard Shore, Hans Zimmer, etc. Anyway I can listen to a great podcast as I code and still have the classical music as background to the Podcast. Acutally this can be very entertaining. I recently have been listening to the latest TWIT and BOL with the Lord of Rings soundtrack behind them. But to each there own.