Visualize the number of searches for singers expected to participate in the NHK Kohaku Uta Gassen | tsurezure lab. こちら徒然研究室（仮称） | ObservableVisualize the number of searches for singers expected to participate in the NHK Kohaku Uta Gassen | tsurezure lab. こちら徒然研究室（仮称） | Observable