This book is one of a small handful commonly referenced when someone asks for a Scheme reference book. Beyond that it is a very good introduction into computational concepts in general.
Abelson, Harold Structure and interpretation of computer programs / Harold Abelson and Gerald Jay Sussman, with Julie Sussman. -- 2nd ed. p. cm. -- (Electrical engineering and computer science series) Includes bibliographical references and index. ISBN 0-262-01153-0 (MIT Press hardcover) ISBN 0-262-51087-1 (MIT Press paperback) ISBN 0-07-000484-6 (McGraw-Hill hardcover) 1. Electronic digital computers -- Programming. 2. LISP (Computer program language) I. Sussman, Gerald Jay. II. Sussman, Julie. III. Title. IV. Series: MIT electrical engineering and computer science series. QA76.6.A255 1996 005.13'3 -- dc20 96-17756 Fourth printing, 1999
It's also a classic of language theory, quite apparent from its use of Scheme for exposition; in fact, CL hears more recommendations of it as a tutorial on programming principles than for Scheme. For the latter role, the usual candidates are The Little Schemer, ...
In Serial summing, some SICP examples are translated to Tcl, from summing an integer sequence to integral and derivative.