Authorized online music took another big step forward Thursday, as the world's two largest record companies said they will roll out their long-planned music-subscription service on Web portal Yahoo! this summer.

Sony Music Entertainment and Universal Music Group, whose formidable artist rosters include Limp Bizkit, Jennifer Lopez, DMX, Pearl Jam and Destiny's Child, plan to offer both downloadable and streaming, on-demand music through the service, called Duet.

The announcement, which follows Monday's revelation that the other three major record companies will offer a similar service through America Online and elsewhere, includes a Napster-like twist. After paying a set monthly fee for music access, users will be able to swap their personalized music playlists with each other, allowing them to share music without moving files from computer to computer.

In a press200 N were applied unilaterally at the most distal point of the frameworks on both sides. Readings of the deformations at the abutment level were obtained with the use of linear strain gauges. A similar pattern of deformation was seen in both configurations. The greatest compressive stress was measured by the strain gauge on the abutment closest to load application and was similar for the 4IMP and 5IMP configurations. The tensile stress measured on the same abutment was higher in the 5IMP configuration than in the 4IMP configuration. In terms of the distribution of stresses, the deformation measured on the central abutment in the 5IMP configuration was less than 10% of the overall stress in all the tested conditions. There was no difference in strain between the two