When Glover choreographs a piece, he improvises as he generates a dance sequence. The pianist often improvises an instrumental solo in between vocal melodies. Oguri does not choreograph, he improvises. Oswald improvises with the saxophone, and is a member of free improvisation group CCMC. When a singer improvises a new melody over chord changes, it is called scat singing. When a musician performs maqam performances, the performer improvises, based on rules. The species improvises extensively in creating new and complex melodies. Eric Stanley improvises on the violin with hip hop music/pop/classical elements and instrumental beats. In faster "fados" the "guitarra" often improvises virtuosically throughout, including soloing over the "fadista's" singing. In addition, a peta drum improvises over the rhythm. The lead djembefola also improvises to a rhythm at times when no-one is dancing. The singer then improvises lyrics stating the reason for holding and performing the present rumba. Guybrush improvises an explosive and sets off an avalanche, burying LeChuck under the theme park. It is led by a single singer, who improvises. The Doctor improvises a solution to teleport them back to the TARDIS.