Originally presented as the author’s dissertation (Ph. D.–Princeton University, 1995). 

This essay and the String Quartet nο. 2 together constitute the dissertation but are otherwise unrelated. 
Professors Scott Burnham and Peter Westergaard were principal readers for this dissertation. 

CONTENTS

ACKNOWLEDGMENTS
LIST OF MUSICAL EXAMPLES
LIST OF DIAGRAMS
INTRODUCTION

CHAPTER I
The “Diabolus” in Sibelius’ Fourth Symphony
The catharsis effected by the tritone

CHAPTER II
Continuity in the Seventh Symphony
Conclusion

APPENDIX
An analysis of the third expansion wave (mm. 72-88) of the Fourth Symphony’s first movement

BIBLIOGRAPHY