What are the 3 main chords?

The I (tonic), IV (subdominant) and V (dominant) chords (primary triads) together encompass all seven tones of the tonic's major scale. These three chords are a simple means of covering many melodies without the use of passing notes. There are tens of thousands of songs written with I, IV and V chords.

en.wikipedia.org - Three-chord song - Wikipedia

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( help · info ) IV-V-I progression in C

A three-chord song is a song whose music is built around three chords that are played in a certain sequence. A common type of three-chord song is the simple twelve-bar blues used in blues and rock and roll. Typically, the three chords used are the chords on the tonic, subdominant, and dominant (scale degrees I, IV and V): in the key of C, these would be the C, F and G chords. Sometimes the V7 chord is used instead of V, for greater tension. The I (tonic), IV (subdominant) and V (dominant) chords (primary triads) together encompass all seven tones of the tonic's major scale. These three chords are a simple means of covering many melodies without the use of passing notes. There are tens of thousands of songs written with I, IV and V chords. Almost all country, blues, and early rock and roll songs are three-chord songs. A great many pop songs are also I, IV and V chord songs.[citation needed] The order of the chord progression may be varied; popular chord progression variations using the I, IV and V chords of a scale are:

V – I – IV

I – V – IV – V

V – IV – I

Beside the I, IV and V chord progression, other widely used 3-chord progressions are:[1]

I – vi – V

I – ii – V

In the mid-1960s, two of the most popular bands, The Beach Boys and The Beatles, began releasing songs that stretched the scope of rock and roll beyond three-chord songs. Even their earlier hits, such as "The Warmth of the Sun",[2] or "She Loves You",[3] featured chord progressions that were somewhat more complex. This led to a movement away from the country and blues base of rock and roll music, towards what would be termed simply rock music, and eventually resulted in the development of progressive rock and its many derivatives. However, the popularity of the three-chord song has always remained, particularly in punk rock, where the Ramones pioneered the three barre chord approach on their debut album Ramones, although on this album there were songs with five, six or seven chords.

Quotes [ edit ]

Songwriter Harlan Howard once said "country music is three chords and the truth."[4] Lou Reed said "One chord is fine. Two chords is pushing it. Three chords and you're into jazz."[5] Reed nevertheless wrote many songs with unique or complex chord progressions himself, such as the material on Berlin.

Why TreeSet does not allow null?

TreeSet adds elements to it according to their natural order. This internally compares the elements with each other using the compareTo (or compare) method. If you try to compare any object with a null value using one of these methods, a NullPointerException will be thrown.

tutorialspoint.com - Why TreeSet Does not allow null values in Java? - Tutorialspoint

TreeSet provides an implementation of the Set interface that uses a tree for storage. Objects are stored in a sorted and ascending order. Access and retrieval times are quite fast, which makes TreeSet an excellent choice when storing large amounts of sorted information that must be found quickly. The reason is, if you look at the internal implementation of the TreeSet, it uses natural ordering, that means TreeSet uses Comparable interface by default to sort its value by comparing other value.

Example

public class TreeSetDemo { public static void main(String args[]) { TreeSet treeSet = new TreeSet(); treeSet.add("Apple"); treeSet.add("Mango"); treeSet.add("Orage"); treeSet.add("grapes"); treeSet.add("Banana"); System.out.println(treeSet); } }

Output

[Apple, Banana, Mango, Orage, grapes]

Example

import java.util.Set; import java.util.TreeSet; public class TreeSetExample { public static void main(String args[]) { Set treeSet = new TreeSet(); //Populating the HashSet treeSet.add(1124); treeSet.add(3654); treeSet.add(7854); treeSet.add(9945); System.out.println(treeSet); //Adding null elements treeSet.add(null); treeSet.add(null); treeSet.add(null); System.out.println(treeSet); } }

Run time exception

Run time exception: [1124, 3654, 7854, 9945] Exception in thread "main" java.lang.NullPointerException at java.util.TreeMap.put(Unknown Source) at java.util.TreeSet.add(Unknown Source) at MyPackage.TreeSetExample.main(TreeSetExample.java:16)

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