5 to 9 much better than most of this season that [he] felt it deserved mention". Sepinwall praised Edelstein's acting and the episode's "day-in-the-life" format, citing "5 to 9" as proof that "there are still really strong elements to this series." Jonah Krakow of IGN rated "5 to 9" 9.2/10, signifying an "outstanding" episode. Kraków compared it positively to the earlier season six episode "Wilson", which similarly varied from the show's traditional format by depicting events from the perspective of House's friend James Wilson. He deemed the episode "amazing", calling it a "great showcase" for Edelstein and suggesting that a show centered on
7-limit tuning Young's "The Well-Tuned Piano", Ben Johnston's String Quartet No. 4, and Lou Harrison's "Incidental Music for Corneille's Cinna". The Great Highland Bagpipe is tuned to a ten-note seven-limit scale: 1:1, 9:8, 5:4, 4:3, 27:20, 3:2, 5:3, 7:4, 16:9, 9:5. In the 2nd century Ptolemy described the septimal intervals: 7/4, 8/7, 7/6, 12/7, 7/5, and 10/7. Those considering 7 to be consonant include Marin Mersenne, Giuseppe Tartini, Leonhard Euler, François-Joseph Fétis, J. A. Serre, Moritz Hauptmann, Alexander John Ellis, Wilfred Perrett, Max Friedrich Meyer. Those considering 7 to be dissonant include Gioseffo Zarlino, René Descartes, Jean-Philippe Rameau, Hermann von Helmholtz, A.