I use a warm-up tape done by the members of Manhattan Transfer, a four-part (soprano, alto, tenor, bass) acapella jazz ensemble. There is a different tape for each voice part. I use the Soprano tape and it has certainly extended my vocal range and helped in other ways besides. The exercises take about half an hour if you do them all, but you can just do the beginning ones if you want to and they'll still make singing easier. My tape covers I believe three octaves. The tapes were made probably ten years ago, but are still available from the Manhattan Transfer's website.

Linda