diff --git a/lib/interval.js b/lib/interval.js
index 3ef3a1f..9f66c85 100644
--- a/lib/interval.js
+++ b/lib/interval.js
@@ -136,6 +136,14 @@ Interval.prototype = {
     return !this.equal(interval) && !this.greater(interval);
   },
 
+  fromSemitones: function(index) {
+    var coord = knowledge.intervalsSemitones[index];
+    if (!coord)
+      throw new Error('Invalid index');
+
+    return new Interval(coord);
+  },
+
   add: function(interval) {
     return new Interval(vector.add(this.coord, interval.coord));
   },
diff --git a/lib/knowledge.js b/lib/knowledge.js
index b1888cc..1d9d130 100644
--- a/lib/knowledge.js
+++ b/lib/knowledge.js
@@ -22,6 +22,22 @@ module.exports = {
     octave: [1, 0]
   },
 
+  intervalsSemitones: {
+    0:  [0, 0],
+    1:  [3, -5],
+    2:  [-1, 2],
+    3:  [2, -3],
+    4:  [-2, 4],
+    5:  [1, -1],
+    6:  [-3, 6],
+    7:  [0, 1],
+    8:  [3, -4],
+    9:  [-1, 3],
+    10: [2, -2],
+    11: [-2, 5],
+    12: [1, 0]
+  },
+
   intervalFromFifth: ['second', 'sixth', 'third', 'seventh', 'fourth',
                          'unison', 'fifth'],
 
diff --git a/lib/note.js b/lib/note.js
index f7f9582..038976a 100644
--- a/lib/note.js
+++ b/lib/note.js
@@ -90,6 +90,11 @@ Note.prototype = {
     return this;
   },
 
+  transposeNew: function(interval) {
+    var coord = vector.add(this.coord, interval.coord);
+    return new Note(coord);
+  },
+
   /**
    * Returns the Helmholtz notation form of the note (fx C,, d' F# g#'')
    */
diff --git a/teoria.js b/teoria.js
index 439d7ed..4d88e20 100644
--- a/teoria.js
+++ b/teoria.js
@@ -446,6 +446,14 @@ Interval.prototype = {
     return !this.equal(interval) && !this.greater(interval);
   },
 
+  fromSemitones: function(index) {
+    var coord = knowledge.intervalsSemitones[index];
+    if (!coord)
+      throw new Error('Invalid index');
+
+    return new Interval(coord);
+  },
+
   add: function(interval) {
     return new Interval(vector.add(this.coord, interval.coord));
   },
@@ -505,6 +513,22 @@ module.exports = {
     octave: [1, 0]
   },
 
+  intervalsSemitones: {
+    0:  [0, 0],
+    1:  [3, -5],
+    2:  [-1, 2],
+    3:  [2, -3],
+    4:  [-2, 4],
+    5:  [1, -1],
+    6:  [-3, 6],
+    7:  [0, 1],
+    8:  [3, -4],
+    9:  [-1, 3],
+    10: [2, -2],
+    11: [-2, 5],
+    12: [1, 0]
+  },
+
   intervalFromFifth: ['second', 'sixth', 'third', 'seventh', 'fourth',
                          'unison', 'fifth'],
 
@@ -737,6 +761,11 @@ Note.prototype = {
     return this;
   },
 
+  transposeNew: function(interval) {
+    var coord = vector.add(this.coord, interval.coord);
+    return new Note(coord);
+  },
+
   /**
    * Returns the Helmholtz notation form of the note (fx C,, d' F# g#'')
    */