Beyonce "Halo" Lady Gaga's "Telephone"...

In March 2010, Lady Gaga's single "Telephone", which has Beyonce Knowles as the featured artist , rose to the top spot on the Pop Songs chart, becoming the 6th number-one on the chart for both Beyonce Knowles and Lady Gaga. With Lady Gaga's single "Telephone", each of the women have tied the record held by Mariah Carey for most No. 1s since the Nielsen BDS-based radio airplay chart launched in